{"title":"Filter","description":"","products":[{"product_id":"askar-e1-e2-2-inch-ultra-duo-narrowband-filter-set-professional-astrophotography-tool-for-deep-sky-imaging","title":"Askar E1 E2 E1+E2 2-inch Ultra Duo-narrowband Filter Set Professional Astrophotography Tool for Deep-sky Imaging","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cb\u003eAskar \u003c\/b\u003e\u003cb\u003eE1\/ E2 \/ E1+E2 \u003c\/b\u003e\u003cb\u003e 2-inch Ultra Duo-narrowband Filter Set Professional Astrophotography Tool for Deep-sky Imaging\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- The Ultra E Filter, as its name suggests, boasts \"Ultra\" halo control capabilities. During its development, we implemented special design optimizations, resulting in a unique filter with one passband at 3nm and another outside the 3nm range.  \u003cbr\u003e\u003cbr\u003e- With the Ultra E Filter, you can shoot high-quality deep-sky images even in areas affected by urban light pollution, atmospheric airglow, or other light sources. The narrower bandwidth and high transmission significantly enhance image contrast, making it easier to reveal subtle details of celestial objects that are typically difficult to shoot.  \u003cbr\u003e\u003cbr\u003e- Beyond the traditional Hα+OIII duo-narrowband filter, the Ultra E filter also introduces an SII+OIII filter.  \u003cbr\u003e\u003cbr\u003e- We designate the Hα+OIII filter as E1 and the SII+OII filter as E2 filter. Together, they form the Ultra E Filter Set, offering color camera users a novel way to achieve results similar to those taken with monochrome cameras and triple narrowband filters - without the need for additional equipment. This opens up new possibilities for astrophotographers to enjoy even more astronomical wonders.  \u003cbr\u003e\u003cbr\u003e- With exceptional halo control and innovative imaging solutions, the Ultra E Filter helps you explore the deeper beauty of the Universe.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eE1:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e- 1 x E1 Filter\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eE2:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e- 1 x E2 Filter\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e\u003c\/b\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eE1+E2:\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e- 1 x E1 Filter\u003cbr\u003e- 1 x E2 Filter\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.thanksbuyer.com\/image\/catalog\/99073\/99075-01.jpg\" data-cke-saved-src=\"https:\/\/www.thanksbuyer.com\/image\/catalog\/99073\/99075-01.jpg\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Askar","offers":[{"title":"E1 (Hα+OIII)","offer_id":46945425293548,"sku":"99073","price":489.0,"currency_code":"USD","in_stock":true},{"title":"E2 (SII+OIII)","offer_id":46945425326316,"sku":"99074","price":489.0,"currency_code":"USD","in_stock":true},{"title":"E1+E2","offer_id":46945425359084,"sku":"99075","price":959.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1759799695-1.jpg?v=1761902297"},{"product_id":"2-inch-filter-drawer-m54-interface-filter-holder-high-quality-astronomical-photography-accessory","title":"TeSeek 2-inch Filter Drawer M54 Interface Filter Holder High Quality Astronomical Photography Accessory","description":"\u003cp\u003e\u003cb\u003eTeSeek 2-inch Filter Drawer M54 Interface Filter Holder High Quality Astronomical Photography Accessory\u003cbr\u003e\u003cbr\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter Drawer\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.byimg.com\/catalog\/98847\/98847-01.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.byimg.com\/catalog\/98847\/98847-02.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"TeSeek Official Store","offers":[{"title":"Default Title","offer_id":46935657021676,"sku":"98847","price":45.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1758504576-1.jpg?v=1761902512"},{"product_id":"sky-rover-56mm-uhc-filter-ultra-high-contrast-filter-specially-designed-for-constellation-telescopes","title":"SKY ROVER 56mm UHC Filter Ultra High Contrast Filter Specially Designed for Constellation Telescopes","description":"\u003cp\u003e\u003cb\u003eSKY ROVER 56mm UHC Filter Ultra High Contrast Filter Specially Designed for Constellation Telescopes\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003eThe 56mm UHC Light Pollution Filter is designed with a 56mm diameter optical glass lens housed in a durable aluminum frame. It features a standard M56 threaded interface for easy installation. Weighing approximately 12 grams, this filter is coated with a double-sided multi-layer coating to enhance light transmission and effectively reduce light pollution, making it ideal for clearer and more detailed astronomical observations.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e* Product Name: 56mm UHC Light Pollution Filter\u003cbr\u003e* Item Number: 25729\u003cbr\u003e* Weight: Approximately 12g\u003cbr\u003e* Lens Material: Optical Glass\u003cbr\u003e* Filter Diameter: 56mm\u003cbr\u003e* Thread Interface: M56\u003cbr\u003e* Frame Material: Aluminum Frame\u003cbr\u003e* Coating: Double-Sided Multi-Layer Coating\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePacking List:\u003c\/b\u003e\u003cbr\u003e* 1 × UHC Filter\u003cbr\u003e    \u003cbr\u003e\u003cb\u003ePackaging Details:\u003c\/b\u003e\u003cbr\u003e* Weight: 0.3kg\u003cbr\u003e\u003c\/p\u003e","brand":"SKY ROVER","offers":[{"title":"Default Title","offer_id":46957066649836,"sku":"97314","price":49.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1752458282-1.jpg?v=1762414607"},{"product_id":"antlia-8-inch-8el-uhc-pro-visual-enhancer-filter-light-damage-filter-for-astronomical-telescope","title":"ANTLIA 8-inch 8EL UHC PRO Visual Enhancer Filter Light Damage Filter for Astronomical Telescope","description":"\u003cp\u003e\u003cb\u003eANTLIA 8-inch 8EL UHC PRO Visual Enhancer Filter Light Damage Filter for Astronomical Telescope\u003cbr\u003e\u003cbr\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.byimg.com\/catalog\/94922\/94922-01.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.byimg.com\/catalog\/94922\/94922-02.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.byimg.com\/catalog\/94922\/94922-03.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":46957072842988,"sku":"94922","price":135.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1742520452-1.jpg?v=1762414876"},{"product_id":"antlia-1-25-inch-u-venus-filter-for-venus-jupiter-cloud-structure-imaging-with-ccd-cameras-on-telescopes","title":"ANTLIA 1.25-inch U-VENUS Filter for Venus\/Jupiter Cloud Structure Imaging with CCD Cameras on Telescopes","description":"\u003cp\u003e\u003cb\u003eANTLIA 1.25-inch U-VENUS Filter for Venus\/Jupiter Cloud Structure Imaging with CCD Cameras on Telescopes\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- This Venus-U filter is designed for imaging the cloud structure of Venus and Jupiter with CCD cameras on a telescope. Cloud details primarily reflect in the ultraviolet band which cannot normally be imaged using broadband filters. The Venus-U filter uses the latest dielectric interference coating technology to achieve high transmission efficiency and exceptional isolation of the critical UV bandwidths. The filter effectively blocks the contrast damaging frequencies beyond 400nm which typically swamp the ultraviolet cloud details on camera sensors. Like the highest quality Antlia LRGB filters, the U-Venus filter minimizes halos around bright stars and increase the contrast.\u003cbr\u003e- When U-Venus filter is used with a planetary camera, it is recommended to remove any protective UV-IR window in front of a color planetary camera because this filter may attenuate transmittance of the critical ultraviolet band that contains cloud details.\u003cbr\u003e- The lower the frequency in the UV band, the longer will be the exposure to achieve sufficient signal in your image. The sensitivity of most sensors also decreases rapidly at shorter UV wavelengths.\u003cbr\u003e- It should be noted that when using DSLR to shoot ultraviolet flowers, the camera needs to be specially modified to remove the infrared cut filter inside the camera.\u003cbr\u003e- In non astronomical use, the lighting conditions may block UV transmissions e.g. the UV contents of electronic flash emission, because of a combination of lower emission at shorter wavelengths and increased absorption by the glass of the flash tube. These factors combine together to require a substantially increased exposure time (for continuous UV sources), UV intensity and ISO sensitivity as the wavelength decreases.\u003cbr\u003e- In addition, the Antilia U-Venus filter can be used not only for shooting planetary celestial bodies, but also for plants, flowers, and even in the fields of ultraviolet criminal investigation and medical imaging. Many photographers have attempted to use ultraviolet filters to shoot many surprising works on plants and flowers. It should be noted that when using DSLR to shoot ultraviolet flowers, special modifications need to be made to the camera. The infrared cutoff filter inside the camera needs to be removed, and the U-Venus filter can be conveniently installed on the camera through the ANTLIA connector.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Optical substrate\u003cbr\u003e- Thickness: 1.25” mounted (2mm+\/-0.05mm)\u003cbr\u003e- Surface Quality: 60\/40 (Refer to MIL-O-13830)\u003cbr\u003e- 2 sides fine-optically polished to ensure accurate 1\/4 wavefront\u003cbr\u003e- 30 arcsec parallelism\u003cbr\u003e- Tave \u0026gt; 80%\u003cbr\u003e- OD3 (\u0026gt; 0.001) at 200-1050nm\u003cbr\u003e- 2 sides Dielectric multi-coating\u003cbr\u003e- Single \/ Non-glued substrate\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFilter Ring:\u003c\/b\u003e\u003cbr\u003e- 1.25”(M28.5x0.6)\u003cbr\u003e- Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003e- Black anodized finish\u003cbr\u003e- Laser engraving no fading\u003cbr\u003e\u003cbr\u003e\u003cb\u003e\u003cfont color=\"#ff0000\"\u003eNotes:\u003cbr\u003e- Using the filter for visual observations is impossible due to the eye's insensitivity to this spectral range (UV).\u003cbr\u003e- This filter is NOT to be used for visual observations, specifically the sun or UV light sources.\u003c\/font\u003e\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.byimg.com\/catalog\/89633\/89633-1.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.byimg.com\/catalog\/89633\/89633-2.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.byimg.com\/catalog\/89633\/89633-3.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.byimg.com\/catalog\/89633\/89633-4.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.byimg.com\/catalog\/89633\/89633-5.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":46957089325292,"sku":"89633","price":185.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1740186339-3.jpg?v=1762415427"},{"product_id":"askar-colour-magic-d1ha-oiii-d2sii-oiii-6nm-2-inch-dual-narrowband-deep-sky-telescope-filter","title":"ASKAR Colour Magic D1(Ha+OIII) \/ D2(SII+OIII) 6nm 2-inch Dual Narrowband Deep-sky Telescope Filter","description":"\u003cp\u003e\u003cb\u003eASKAR Colour Magic 6nm 2-inch Dual Narrowband Deep-sky Telescope Filter\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- For all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. The dedicated astronomy filters for deep-sky imaging can effectively eliminate the influence from the background light and enhance the contract of your photographs and make the targets displayed more clearly and delicately. Askar’ s new-launched 6nm deep-sky Duo-narrowband Filter set colour Magic is a professional astrophotography tool specifically designed for deep-sky imaging.\u003cbr\u003e\u003cbr\u003e- This 6nm filter set has a narrow bandwidth. Therefore, even if your are at an area affected by the urban light pollution, night glow and other undesired light, you can capture high-quality deep-sky pictures with the help of Askar 6nm Duo-narrowband Filters. The narrower bandwidth and efficient light transmission considerably enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot.\u003cbr\u003e\u003cbr\u003e- At the same time, the Colour Magic 6nm deep-sky Duo-narrowband Filter has very good halation control, providing more contribution to your astrophotography.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x  Filter\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ASKAR","offers":[{"title":"D1(Ha+OIII) + D2(SII+OIII)","offer_id":47028324040940,"sku":"87261","price":535.0,"currency_code":"USD","in_stock":true},{"title":"D1(Ha+OIII)","offer_id":47028324073708,"sku":"87262","price":285.0,"currency_code":"USD","in_stock":true},{"title":"D2(SII+OIII)","offer_id":47028324106476,"sku":"87263","price":285.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1704677172-1.jpg?v=1762415560"},{"product_id":"antlia-4-channel-quad-band-astronomical-filter-anti-light-pollution-filter-for-color-camera-support-f2-telescope","title":"ANTLIA 4-Channel Quad Band Astronomical Filter Anti-light Pollution Filter for Color Camera Support F2 Telescope","description":"\u003cp\u003e\u003cb\u003eANTLIA 4-Channel Quad Band Astronomical Filter Anti-light Pollution Filter for Color Camera Support F2 Telescope\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- The Quad Band Anti-Light Pollution Ultra Filter is a light suppression filter for OSC and monochrome cameras. It is able to shoot more objects in the visible to NIR spectrum range, like galaxies, reflect ion nebulae, emission nebula and star clusters from a Bortle 8 location to Bortle 1 by spectral transmission in the visible light spectrum, near-infrared and near-ultraviolet bands. When photographing full-spectrum galaxies under light polluted conditions, the Quad Band filter enhances the near-infrared signals, resulting in improved image contrast and signal-to-noise ratio while maintaining good color balance. Also, it has a broad bandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003cbr\u003e- Considering the high quantum efficiency (QE) characteristics of the latest cameras in the near-infrared region and this region is less susceptible to artificial light pollution the Quad Band filter adds high transmission in NIR. This spectrum design improves image signal-to-noise ratio and contrast by capturing signals within this range while also facilitating color balance and easier to manage in post-processing.\u003cbr\u003e- Please note that not all objects contain strong signal in the near-infrared (NIR) region. For instance, emission nebulae and planetary nebulae, which are typical examples of line spectrum objects, demonstrate limited signal in the NIR region. Conversely, certain full-spectrum objects like M51, M83 possess significant NIR signal, you can possibly shoot these objects more contrasted with the Quad Band filter. When using this filter with a camera that has UV\/IR cut protective glass, the visible band Transmission signal is retained, which limits your ability to shoot targets with infrared signal. Therefore, the Quad Band filter is more suitable for cameras with AR protective glass as they can shoot both NIR and visible band signals.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Quad Band Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/87013\/87013-1.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/87013\/87013-2.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/87013\/87013-3.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/87013\/87013-4.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/87013\/87013-5.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/87013\/87013-6.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/87013\/87013-7.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":46957093978348,"sku":"87013","price":218.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1703554426-2.jpg?v=1762415607"},{"product_id":"optolong-l-pro-2-inch-telescope-filter-for-schott-glasses-iad-coating-high-quality-astronomical-accessory","title":"Optolong L-PRO 2-inch Telescope Filter for Schott Glasses IAD Coating High Quality Astronomical Accessory","description":"\u003cp\u003e\u003cb\u003eOptolong L-PRO 2-inch Telescope Filter for Schott Glasses IAD Coating High Quality Astronomical Accessory\u003cbr\u003e\u003cbr\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- It uses high-quality substrate, undergoes double-sided grinding, polishing, and planar interferometer testing to ensure the flatness of the substrate, resulting in ultra-high optical performance of the coated product.\u003cbr\u003e- Exquisite packaging, EVA material, lined with high-density sponge.\u003cbr\u003e- Laser engraved logo with ultra-thin frame design.\u003cbr\u003e- After spectral testing with the spectrophotometer for Shimadzu, it is ensured that the filter has accurate spectral characteristics.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Material: for Schott glasses\u003cbr\u003e- Process: double sided precision grinding and polishing treatment, filter edge sanding and matte treatment, IAD Coating, high-quality aviation aluminum material, CNC processing, filter ring anodizing treatment.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x 2-inch Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/85020\/85020-1.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/85020\/85020-2.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":46957096894700,"sku":"85021","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1729645468-4.jpg?v=1762415694"},{"product_id":"optolong-l-pro-1-25-inch-telescope-filter-for-schott-glasses-iad-coating-high-quality-astronomical-accessory","title":"Optolong L-PRO 1.25-inch Telescope Filter for Schott Glasses IAD Coating High Quality Astronomical Accessory","description":"\u003cp\u003e\u003cb\u003eOptolong L-PRO 1.25-inch Telescope Filter for Schott Glasses IAD Coating High Quality Astronomical Accessory\u003cbr\u003e\u003cbr\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- It uses high-quality substrate, undergoes double-sided grinding, polishing, and planar interferometer testing to ensure the flatness of the substrate, resulting in ultra-high optical performance of the coated product.\u003cbr\u003e- Exquisite packaging, EVA material, lined with high-density sponge.\u003cbr\u003e- Laser engraved logo with ultra-thin frame design.\u003cbr\u003e- After spectral testing with the spectrophotometer for Shimadzu, it is ensured that the filter has accurate spectral characteristics.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Material: for Schott glasses\u003cbr\u003e- Process: double sided precision grinding and polishing treatment, filter edge sanding and matte treatment, IAD Coating, high-quality aviation aluminum material, CNC processing, filter ring anodizing treatment.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x 1.25-inch Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/85020\/85020-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.byimg.com\/catalog\/85020\/85020-2.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":46957096993004,"sku":"85020","price":122.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1694596896-1.jpg?v=1762415700"},{"product_id":"optolong-l-extreme-2-quot-mounted-7nm-dual-narrowband-filter-telescope-accessory-for-dslr-amp-ccd-cameras","title":"Optolong L-eXtreme 2\" Mounted 7nm Dual Narrowband Filter Telescope Accessory for DSLR \u0026 CCD Cameras","description":"\u003cb\u003eOptolong L-eXtreme 2\" Mounted 7nm Dual Narrowband Filter Telescope Accessory for DSLR \u0026amp; CCD Cameras\u003cbr\u003e\u003cbr\u003eL-eXtreme Introduction:\u003c\/b\u003e\u003cbr\u003eL-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter.\u003cbr\u003e\u003cbr\u003eUnlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines.The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.\u003cbr\u003e\u003cbr\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life. Therefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpectrum and Characteristics:\u003c\/b\u003e\u003cbr\u003e- Substrate: B270\u003cbr\u003e- Thickness: 1.85mm\u003cbr\u003e- Tpeak: T\u0026gt;90%\u003cbr\u003e- Blocking range: 300-1000nm\u003cbr\u003e- Blocking depth: light pollution line blocking \u0026gt;99%\u003cbr\u003e- Surface quality: 60\/40\u003cbr\u003e- Transmitted Wavefront RMS: λ\/4\u003cbr\u003e- Parallelism: 30s\u003cbr\u003e\u003cbr\u003e\u003cb\u003eCoating Technology:\u003c\/b\u003e\u003cbr\u003e- Multi-layers anti-reflection coating\u003cbr\u003e- Non-cementing optical substrate coating\u003cbr\u003e- Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.\u003cbr\u003e- Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e- 2\" mounted for eyepiece\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Dual Narrowband Filter\u003cbr\u003e- 1 x Plastic Box\u003cbr\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":46957099319532,"sku":"82947","price":212.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1705540140-3.jpg?v=1762415783"},{"product_id":"askar-2-inch-dual-band-pass-filter-c1ha-oiii-c2sii-oiii-for-mono-and-colorful-camera-deepsky-photography","title":"Askar 2-inch Dual Band Pass Filter C1(Ha+OIII) \/ C2(SII+OIII) for Mono and Colorful Camera DeepSky Photography","description":"\u003cp\u003e\u003cb\u003eAskar 2-inch Dual Band Pass Filter C1(Ha+OIII) \/ C2(SII+OIII) for Mono and Colorful Camera DeepSky Photography\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- The use of C dual bandpass filters can effectively enhance the contrast of the entire image, making it easier to present the detailed features of celestial bodies that were previously difficult to get. During the shooting process, even in areas affected by urban light pollution, atmospheric night glow, and other light sources, you can still take high-quality deep space photos.\u003cbr\u003e\u003cbr\u003e- We refer to the Ha+OIII dual bandwidth filter as C1, and the SII+OIII dual bandwidth filter as C2. The combination of the two is the ColourMagic C filter set. This provides a new gameplay for color camera users to capture similar effects without using black and white cameras and three channel single narrow filters, helping astronomy enthusiasts enjoy more astronomical fun.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eC1 Features:\u003c\/b\u003e\u003cbr\u003e- ColourMagic C1 dual bandpass filter (Ha+OIII) has a high transmittance of around 90% at central wavelengths (500.7nm and 656.6nm). This feature allows the filter to effectively improve the quality of the image, making the sky background of the image darker, while maximizing the contrast of the entire picture. For details of stars that are difficult to photograph, these details can be more easily represented in the image with the C1 filter. In areas where light pollution is very serious, the filter can also selectively filter light pollution and chaotic signals through the emission lines of the nebula to achieve the ideal shooting effect.\u003cbr\u003e\u003cb\u003e\u003cbr\u003eC2 Features:\u003c\/b\u003e\u003cbr\u003e- In addition to the traditional Ha+OIII dual narrow filter, the C filter is the same as the Super D filter, and another filter structure is introduced -- SII+OIII filter. When using color cameras to photograph deep space galaxies, double-band filters of Ha and OIII bands are often used to filter light, while single-band filters of Ha, SII and OIII bands are often used when using black and white cameras, so that users using color cameras will miss a band of nebula details. The use of C2 double bandpass filter (SII+OIII) can compensate for this lack, the band ColourMagic C2 double bandpass filter (SII+OIII) at the central wavelength 500.7nm and 672nm has a high transmittance of about 90%, which can effectively darken the sky background of the image. And maximize the contrast of the entire picture, so that the original difficult to photograph the detailed features of the star can be more easily presented. In areas where light pollution is very serious, the product can also selectively filter light pollution and chaotic signals through the emission lines of the nebula to achieve the ideal shooting effect.\u003cbr\u003e\u003cb\u003e\u003cbr\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- FWHM: OIII: OIII: 35nm+\/-5nm\/Ha: 15nm+\/-3nm\u003cbr\u003e- CWL: 500.7nm \u0026amp; 656.6nm\u003cbr\u003e- Peak transmission: 90%\u003cbr\u003e- Thickness: 2 +\/- 0.5mm\u003cbr\u003e- Barrier property: \u0026gt;= OD3 at 200 - 1100nm\u003cbr\u003e- Surface finish: 60\/40\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage Included: (\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eC1+C2)\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e- 1 x C1 Filter\u003cbr\u003e- 1 x C2 Filter\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage Included: \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e(C2)\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e- 1 x C2 Filter\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage Included:\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e(C1)\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e- 1 x C1 Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87289\/87289-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87289\/87289-2.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"C1 (Hα+OIII)","offer_id":47121475436780,"sku":"87289","price":108.0,"currency_code":"USD","in_stock":true},{"title":"C2 (SⅡ+OIII)","offer_id":47121475469548,"sku":"87290","price":108.0,"currency_code":"USD","in_stock":true},{"title":"C1 + C2","offer_id":47121475502316,"sku":"87291","price":198.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1708132170-3.jpg?v=1765185349"},{"product_id":"optolong-l-para-dual-narrowband-filter-2-inch-10nm-light-pollution-filter-astronomical-accessory","title":"OPTOLONG L-Para Dual Narrowband Filter 2-inch 10nm Light Pollution Filter Astronomical Accessory","description":"\u003cp\u003e\u003cb\u003eOPTOLONG L-Para Dual Narrowband Filter 2-inch 10nm Light Pollution Filter Astronomical Accessory\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- L-Para is a brand new dual narrowband 10nm light pollution filter, with OIII (500.7nm) and H-Alpha (656.3nm) signal half bandwidth values of 10nm. This filter has a transmittance of over 85% for nebula emission lines OIII and Ha in F2 and above focal ratio systems, effectively filtering out light pollution emission lines from mercury lamps, sodium lamps, LEDs, and other sources.\u003cbr\u003e- At the same time, it has excellent contrast and anti halo properties, allowing you to catch detailed and vivid nebula images. L-Para is not only suitable for ordinary optical systems, but can also be easily applied to fast optical systems such as systems for RASA and Hyperstar. Even when the light is obliquely incident, it can still maintain high transmittance, providing you with a clear and accurate shooting experience.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- Anti halo feature: the process has undergone multiple optimizations and has been repeatedly tested and verified for six months. The anti halo effect is particularly significant, improving the shooting effect of bright stars.\u003cbr\u003e- Wide applicability: a dual narrowband filter suitable for all telescope systems, suitable for telescope systems ranging from fast mirrors (focal ratios F2, F2.8, F3.2, F4) to various ordinary focal ratios.\u003cbr\u003e- Anti light damage ability: effectively cutting off light pollution emission line bands such as mercury lamps, sodium lamps, LEDs, etc., can be applied to light damage environments such as Porter 1-7.\u003cbr\u003e- High transmittance: in F2 and above focal ratio systems, the transmission rates of nebula emission lines OIII and Ha are both greater than 85%, resulting in more efficient imaging efficiency.\u003cbr\u003e- High contrast: by utilizing the high transmittance of nebula emission lines (OIII \u0026amp; Ha) and the high cut-off depth of light damage bands (suppressing light damage and sky background stray light), the image has higher contrast and richer details.\u003cbr\u003e\u003cbr\u003eBased on the characteristics of celestial target emission lines and light pollution emission lines, as well as the fast and ordinary systems of telescopes, while retaining the high transparency filtering of OIII and Ha signals, the light pollution emission lines are cut off. After special design and optimization, a dual channel spectrum is formed as shown in the following figure:\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/93561\/93561-1.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003cbr\u003e\u003c\/p\u003e","brand":"OPTOLONG","offers":[{"title":"Default Title","offer_id":47114418520300,"sku":"93561","price":188.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1739408628-4.jpg?v=1765877829"},{"product_id":"antlia-36mm-3nm-pro-narrowband-filter-h-alpha-astronomical-accessory-for-deep-space-photography","title":"ANTLIA 36mm 3nm Pro Narrowband Filter H-alpha\/SII\/OIII Astronomical Accessory for Deep Space Photography","description":"\u003cp\u003e\u003cb\u003eANTLIA 36mm 3nm Pro Narrowband Filter H-alpha\/SII\/OIII Astronomical Accessory for Deep Space Photography\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- Antlia 3nm is an extremely narrow bandwidth filter designed specifically for deep space photography, allowing only high transmittance of light with a 3nm bandwidth centered at wavelengths of 656.3nm, 671.6nm, and 500.7nm. This is the wavelength corresponding to the H-alpha, SII, and OIII emission lines. The design of the extremely narrow bandwidth can effectively improve the contrast of this band, highlight the details and layers contained in the nebula, and effectively suppress interference from other bands, especially artificial mercury\/sodium lamps.\u003cbr\u003e- The design of this series of filters is aimed at improving the contrast in nebulae during astronomical photography, reducing background interference, and highlighting the details and layers of nebulae. We require a cutoff of OD5 (above 0.00001) to reduce interference from other bands.\u003cbr\u003e- Suitable for most celestial bodies emitting nebulae, planetary nebulae, and supernova remnants, it can effectively highlight the details of H-alpha, SII, and OIII contained in these celestial bodies.\u003cbr\u003e- The design of extremely narrow bandwidth results in low light flux of the filter. We recommend using a large aperture telescope and extending the exposure time to collect enough light flux to display the details and layers of faint celestial bodies under the H-alpha extremely narrow filter.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- High contrast and high signal-to-noise ratio: Antlia 3nm Pro adopts a new coating technology, double-sided multi-layer coating. Although this exponentially increases the coating time and cost, it can achieve better contrast. By suppressing background interference, narrower passband can achieve better results, providing excellent and weak detail levels and contrast for nebulous celestial bodies.\u003cbr\u003e- Finer star points, smaller halo: The Antlia 3nm Pro's ultra narrow band and high cutoff design makes its star points finer and reduces the halo of bright stars. We actually tested that there is no halo under zero magnitude stars, even bright stars like Alnitak (1.46) can reduce the halo.\u003cbr\u003e- The design of the extremely narrow bandwidth results in a low light flux of the filter. We recommend using a large aperture telescope and extending the exposure time to collect enough light flux to display the details and layers of the faint celestial bodies under the 3nm Pro extremely narrow filter.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplication and Performance:\u003c\/b\u003e\u003cbr\u003e- A very narrow filter designed for astronomical photography, suitable for capturing emission nebulae, planetary nebulae, supernova remnants, and other celestial bodies containing OIII components.\u003cbr\u003e- Pairing SII and Ha filters allows for post production of Hubble colors.\u003cbr\u003e- This filter does not brighten up deep space objects, it only filters out light from other bands, highlighting the contrast of the bands.\u003cbr\u003e- This filter is not recommended for visual inspection of deep space celestial bodies.\u003cbr\u003e- This filter is not suitable for observing and shooting the sun.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Type: optical glass\u003cbr\u003e- Filter thickness: 2mm+\/-0.05mm for 36mm (diameter) unmounted\u003cbr\u003e- Surface finish: 60\/40 (compliant with US MIL-O-13830)\u003cbr\u003e- Double sided grinding and polishing\u003cbr\u003e- Surface type: 1\/4 λ\u003cbr\u003e- Parallelism: 30 inches\u003cbr\u003e- OD5(0.001%) at 300-1000nm\u003cbr\u003e- Double sided multi-layer nano coating\u003cbr\u003e- Single piece non bonded optical glass\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Narrowband Filter\u003cbr\u003e\u003cbr\u003eH-ALPHA 250-880nm Spectrogram:\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/91298\/91298-1.jpg\"\u003e\u003cbr\u003e\u003cbr\u003eH-ALPHA 600-700nm Spectrogram (first level magnification):\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/91298\/91298-2.jpg\"\u003e\u003cbr\u003e\u003cbr\u003eSII 250-880nm Spectrogram:\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/91298\/91298-3.jpg\"\u003e\u003cbr\u003e\u003cbr\u003eSII 600-700nm Spectrogram (first level magnification):\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/91298\/91298-4.jpg\"\u003e\u003cbr\u003e\u003cbr\u003eO3 250-880nm Spectrogram:\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/91298\/91298-5.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"H-alpha","offer_id":47121333584108,"sku":"91298","price":279.0,"currency_code":"USD","in_stock":true},{"title":"SII","offer_id":47121333616876,"sku":"91299","price":279.0,"currency_code":"USD","in_stock":true},{"title":"OIII","offer_id":47121333649644,"sku":"91300","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1725585529-1.jpg?v=1765877873"},{"product_id":"antlia-h-beta-and-o3-filter-uhc-filter-1-25-inch-mount-for-visual-and-photography-high-quality-astronomical-accessory","title":"ANTLIA H-Beta and O3 Filter UHC Filter 1.25-inch Mount for Visual and Photography High Quality Astronomical Accessory","description":"\u003cp\u003e\u003cb\u003eANTLIA H-Beta and O3 Filter UHC Filter 1.25-inch Mount Interface for Visual and Photography High Quality Astronomical Accessory\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- Antlia HB \u0026amp; OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter.\u003cbr\u003e- When it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMain Application and Performance:\u003c\/b\u003e\u003cbr\u003e- Antlia HB \u0026amp; OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3 at 350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.\u003cbr\u003e- The HB \u0026amp; OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies.\u003cbr\u003e- Since human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89635\/89635-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89635\/89635-2.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":47114418618604,"sku":"89635","price":102.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1718591715-1.jpg?v=1765877895"},{"product_id":"antlia-36mm-gold-filter-alt-p-dual-channel-5nm-narrow-band-ha-o3-strong-light-damage-filter-astronomical-accessory","title":"ANTLIA 36mm Gold Filter ALT-P Dual Channel 5nm Narrow-band Ha\/O3 Strong Light Damage Filter Astronomical Accessory","description":"\u003cp\u003e\u003cb\u003eANTLIA 36mm Gold Filter ALT-P Dual Channel 5nm Narrow-band Ha\/O3 Strong Light Damage Filter Astronomical Accessory\u003cbr\u003e\u003cbr\u003eAntlia ALP-T Dualband 5nm Narrowband filter:\u003c\/b\u003e\u003cbr\u003e- Because the color is golden yellow, also known as \"gold filter\", the advanced coating process is used to achieve 500.7nm (OIII 5nm), 656.3nm(Halpha 5nm), high transmission of two bands, 0111:T\u0026gt;82%, Ha:T\u0026gt;90%, and out of the passband, we achieved OD4.5 out-of-band blocking, which will effectively block the impact of city light damage, sky light and other background light, so that the nebula presents a better contrast.\u003cbr\u003e- Gold filter double 5nm design, suitable for color camera and black and white camera shooting, which will be more effective to improve the efficiency of shooting. Whether in urban or suburban areas, nebulae can show better detail and contrast.\u003cbr\u003e- Prior to mass production, we optimized the Halo problem of interest to minimize the halo design.\u003cbr\u003e- Better coating process: The Dualband 5nm filter (Gold filter) is mainly a substrate coating after a double-sided finishing process, which is optimized with a better coating process to ensure high transmittance of Ha and OIII bands.\u003cbr\u003e- High contrast and signal-to-noise ratio: Dualband 5nm filter (Gold filter) uses a new coating technology, double-sided multilayer coating, although this increases the coating time and cost, but can get better contrast, by suppressing background interference, you can get better level and contrast.\u003cbr\u003e- The finer star points minimize the halo: The Dualband 5nm filter (Gold filter) has a high cutoff design that makes its star point thinner and minimizes the halo of bright stars.\u003cbr\u003e- Main uses and performance mainly with color camera for CMOS\/CCD\/DSLR, can also be paired with black and white camera to highlight Ha\/O3 band, improve shooting efficiency, suitable for shooting emission nebula, planetary nebula.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- 500.7nm (O3 5nm), 656.3nm (Halpha 5nm)\u003cbr\u003e- O3: T \u0026gt; 82%, Ha: T \u0026gt; 90%\u003cbr\u003e- OD4.5 at 300-1100 nm\u003cbr\u003e- Optical glass\u003cbr\u003e- 2\" is 2mm +\/- 0.05mm\u003cbr\u003e- Surface finish: 60\/40 (compliant with the US Army table MIL-0-13830)\u003cbr\u003e- Double-sided grinding polishing\u003cbr\u003e- Surface type: 1\/4λ\u003cbr\u003e- Parallelism: 30\"\u003cbr\u003e- Double-sided multilayer nano coating\u003cbr\u003e- Single piece of unglued optical glass\u003cbr\u003e- Size with mirror ring: 2\" (M48 x 0.75)\u003cbr\u003e- Ultra-thin mirror ring design\u003cbr\u003e- Aviation aluminum CNC processing\u003cbr\u003e- Black oxidation treatment\u003cbr\u003e- Laser engraving\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89634\/89634-1.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89634\/89634-2.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89634\/89634-3.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89634\/89634-4.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":47114418684140,"sku":"89634","price":295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1718591627-2.jpg?v=1765877901"},{"product_id":"antlia-solar-discover-mini-version-solar-filter-1-25-adapter-for-dual-band-ha-cak-and-cah-imaging-astronomical-accessory","title":"ANTLIA Solar Discover Solar Filter 1.25” Adapter for Dual-band Ha\/CaK and CaH Imaging Astronomical Accessory","description":"\u003cp\u003e\u003cb\u003eANTLIA Solar Discover Solar Filter 1.25” Adapter for Dual-band Ha\/CaK and CaH Imaging Astronomical Accessory\u003cbr\u003e\u003cbr\u003eApplication and Performance:\u003c\/b\u003e\u003cbr\u003e- New to the Antlia Solar Discover series product is the dualband Ha, CaK, and CaH filter assembly and its mini version, a filter assembly specifically designed for solar photospheric photography, which effectively provides better contrast and sharpness of the solar imaging - with more surface detail visible as a result; highlights detail of the Sunspot as well as provides higher contrast of the Solar Facula. This complete assembly comes with a Antlia ERF filter, functions to block UV and IR light, and allows the desired wavelengths Ha 656.3nm, CaK 393.3nm, and CaH 396.8nm to pass through. In addition, necessary ND filter is already manufacture installed.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- New structure design is used for the Antlia Solar Discover Dualband filter assembly, installation is similar to the Antlia CaK 3nm Solar Herschel Wedge, with the telescope attached at one end and the camera at the another. The metal ring machined from aircraft aluminum CNN and oxidized. The filters are assembled in a fully closed tube. No stray light can escape from this.\u003cbr\u003e- Compared to other solar reducing films, the Antlia Solar Discover Dualband filter assembly allows for higher contrast for solar imaging, excellent resolution of the Solar surface, and the assembly that is less prone to wear and tear, easier to use, and longer product lifespan. And can be directly used for solar photospheric imaging, such as sunspots.\u003cbr\u003e- 1. 25” and 2” Adapters: the Antlia Solar Discover Dualband Ha, CaK and CaH filter assembly combines the 1.25'' and 2'' adapter used in astrophotography for easier and faster connection of telescopes and planetary cameras. The standard version is compatible with both 1.25'' and 2” adapters, while the mini version is designed with 1.25'' adapter.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Solar Filter Assembly\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89631\/89631-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89631\/89631-2.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/89631\/89631-3.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Standard Version","offer_id":47121347346668,"sku":"89631","price":172.0,"currency_code":"USD","in_stock":true},{"title":"Mini Version","offer_id":47121347379436,"sku":"89632","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1718591223-1.jpg?v=1765877952"},{"product_id":"optolong-3nm-l-ultimate-dual-narrowband-filter-for-astronomical-color-camera-light-pollution-decrease","title":"Optolong 3nm L-Ultimate Dual Narrowband Filter for Astronomical Color Camera Light Pollution Decrease","description":"\u003cp\u003e\u003cb\u003eOptolong 3nm L-Ultimate Dual Narrowband Filter for Astronomical Color Camera Light Pollution Decrease\u003cbr\u003e\u003cbr\u003eAdvantage:\u003c\/b\u003e\u003cbr\u003e- The advantage of L-Ultimate is that it only passes through the emission lines OIII (500.7nm) and Ha (656.3nm) of the nebula, and in this case, all other light contaminated rays are cut off, so that only the signals of the emission and reflection nebula can be obtained during imaging. Therefore, it can make the sky background of the image darker, and maximize the contrast and signal-to-noise ratio between nebulae. In areas severely affected by light pollution, this product can also selectively filter out light pollution and noise signals through nebular emission lines, ultimately avoiding the impact of light pollution on astronomical photography.\u003cbr\u003e- The difference between this product and the same series of dual narrowband L-eNhance and L-eXtreme lies in that L-Ultimate is a dual 3nm bandpass filter that only passes through Ha and OIII emission lines, which can obtain a darker sky background in photography, and has stronger suppression on star points, contrast between nebulae, and contrast enhancement. The filter has also been optimized in terms of halo performance, so there will be no obvious halo when shooting bright star targets.\u003cbr\u003e\u003cb\u003e\u003cbr\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Filter material: optical glass\u003cbr\u003e- Filter thickness: 1.85mm\u003cbr\u003e- Bandwidth value: OIII 3nm; Ha 3nm\u003cbr\u003e- Cutoff range: 300 - 1000nm\u003cbr\u003e- Cutoff depth: \u0026gt; OD4\u003cbr\u003e- Degree of finish: 60\/40\u003cbr\u003e- Surface shape: λ\/4\u003cbr\u003e- Depth of parallelism: 30 seconds\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1080px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87328\/87328-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1080px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87328\/87328-2.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47114419372268,"sku":"87328","price":278.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1705281848-1.jpg?v=1765878065"},{"product_id":"zwo-1-25-inch-uv-ir-cut-filter-700nm-cutoff-wavelength-for-color-cameras-infrared-light-blocking","title":"ZWO 1.25-inch UV IR-CUT Filter 700nm Cutoff Wavelength for Color Cameras Infrared Light Blocking","description":"\u003cp\u003e\u003cb\u003eZWO 1.25-inch UV IR-CUT Filter 700nm Cutoff Wavelength for Color Cameras Infrared Light Blocking\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- 1.25″ IR UV CUT filter is suitable for color camera with AR protect window.\u003cbr\u003e- This IR-Cut Filter blocks infrared light from reaching the sensor of your CCD or CMOS camera or your expensive H-alpha filter. When imaging, the addition of this simple and inexpensive accessory will result in sharper images, and when doing solar work, the IR Cut Filter will your protect H-alpha filter from the damaging effects of infrared radiation.\u003cbr\u003e- Infrared or IR light is invisible to the human eye, and so even though most telescopes are not designed to focus IR light, it does not matter when you are using your telescope visually. However, when you add a camera to the mix, its a whole other story! Unlike the human eye, a silicon sensor is very sensitive to light in the infrared portion of the spectrum, and that is a problem because infrared images are blurry as all get out. That means your nice, sharp visual light image is degraded by the addition of the infrared layer. This problem can easily be solved by blocking the infrared, and the IR Cut-Off, will do just that.\u003cbr\u003e- The IR-Cut filter is housed in a 1.25” cell, and has internal threads so that you can stack filters together. The filter comes with a protective plastic case.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Thread: M28x0.6\u003cbr\u003e- Cutoff wavelength: 700nm\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x UV IR-CUT Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87280\/87280-1.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":47114419962092,"sku":"87280","price":19.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1704764108-1.jpg?v=1765878076"},{"product_id":"antlia-triband-rgb-ultra-filter-3-in-1-colorful-camera-filter-for-light-pollution-suppression-for-osc-mono-cameras","title":"ANTLIA Triband RGB Ultra Filter 3-In-1 Colorful Camera Filter for Light Pollution Suppression for OSC\/Mono Cameras","description":"\u003cp\u003e\u003cb\u003eANTLIA Triband RGB Ultra Filter 3-In-1 Colorful Camera Filter for Light Pollution Suppression for OSC\/Mono Cameras\u003cbr\u003e\u003cbr\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-2.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-3.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-4.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-5.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-6.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-7.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-8.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 800px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87264\/87264-9.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":47114421764332,"sku":"87264","price":218.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1718240435-4.jpg?v=1765961478"},{"product_id":"new-zwo-m42-thread-high-quality-filter-holder-for-2-inch-filter-drawer-astronomical-accessories","title":"ZWO M42\/M54 Thread High Quality Filter Holder for 2-inch Filter Drawer Astronomical Accessories","description":"\u003cp\u003e\u003cb\u003eNew ZWO M42 Thread High Quality Filter Holder for 2-inch Filter Drawer Astronomical Accessories\u003cbr\u003e\u003cbr\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- The filter holder has standard M48x0.75 threads for 2” mounted astronomy filters.\u003cbr\u003e- This new filter holder will fit ONLY the ZWO filter drawers such as: FD-M42-II M42\/M48 filter drawer, FD-M54-II M54 filter drawer, FD-EOS for Canon EOS filter drawer, FD-Nikon for Nikon filter drawer.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePrecaution:\u003c\/b\u003e\u003cbr\u003e- This new 'universal' filter holder is compatible with v2 M42 and M54 filter drawers available from early December 2022 onwards, please check you have the '-II' version otherwise these will not fit.\u003cbr\u003e- It is compatible with all versions of the ZWO EOS and Nikon filter drawers.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x  Filter Holder\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87249\/87249-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87249\/87249-2.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87249\/87249-3.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"M42 Filter Holder","offer_id":47121360322796,"sku":"87250","price":35.0,"currency_code":"USD","in_stock":true},{"title":"M54 Filter Holder","offer_id":47121360355564,"sku":"87249","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1714957730-7.jpg?v=1765878100"},{"product_id":"antlia-130mm-lens-dual-band-nd-filter-dual-erf-h-alpha-amp-cak-cah-solar-neutral-density-filter-astronomical-accessory","title":"ANTLIA Dual-band ND Filter Dual ERF H-Alpha \u0026amp; Cak\/CaH Solar Neutral Density Filter Astronomical Accessory","description":"\u003cp\u003e\u003cb\u003eANTLIA Dual-band ND Filter Dual ERF H-Alpha \u0026amp; Cak\/CaH Solar Neutral Density Filter Astronomical Accessory\u003cbr\u003e\u003cbr\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eDual-band 25nm H-Alpha \u0026amp; CaK \u0026amp; CaH Line:\u003c\/b\u003e\u003cbr\u003e- It adopted the latest process design with high transmittance, high cutoff, and flat top optimization, as well as advanced coating technology to ensure the accuracy of its wavelength.\u003cbr\u003e- T \u0026gt; 95% at H-Alpha, FWHM 25nm\u003cbr\u003e- T \u0026gt; 90% at CaK \u0026amp; CaH, FWHM 25nm\u003cbr\u003e\u003cbr\u003e\u003cb\u003eBlocking: 200-1700nm:\u003c\/b\u003e\u003cbr\u003e- The ultra far design of UVIR cutoff, due to the strong solar energy, Antlia's coating range is wider, from 200-1700nm, which more blocks the solar energy in the infrared band, with OD4 (0.01%) at 300-1200nm out of band barrier design, designed for safety considerations.\u003cbr\u003e\u003cbr\u003e\u003cb\u003e1\/4 λ Quartz Substrate Production:\u003c\/b\u003e\u003cbr\u003e- The Antlia Dual ERF H-Alpha\/CaK\/CaH Solar Filter uses quartz substrate after secondary double-sided precision polishing with 1\/4λ waveform, it has better thermal stability, lower glass expansion coefficient, and a denser film layer, which is not easily affected by the environment and has a longer service life, while 1\/4λ waveform ensures that, when paired with professional solar observation equipment, the impact of surface shape on image quality and wavelength on the image is minimized.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x ND Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-2.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-3.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-4.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-5.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-6.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-7.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-8.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/87015\/87015-9.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"130mm-Lens","offer_id":47121384145132,"sku":"87015","price":935.0,"currency_code":"USD","in_stock":true},{"title":"150mm-Glass","offer_id":47121384177900,"sku":"87016","price":1119.0,"currency_code":"USD","in_stock":true},{"title":"200mm-Glass","offer_id":47121384210668,"sku":"87017","price":1839.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1755651716-11.jpg?v=1765878122"},{"product_id":"hyo-1-25-inch-duo-narrowband-filter-high-transmittance-for-severe-light-pollution-astronomical-photography","title":"TeSeek 1.25-inch\/2-inch Duo-narrowband Filter High Transmittance for Severe Light Pollution Astronomical Photography","description":"\u003cp\u003e\u003cb\u003eHYO 1.25-inch\/2-inch Duo-narrowband Filter High Transmittance for Severe Light Pollution Astronomical Photography\u003cbr\u003e\u003cbr\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- Extremely narrow bandwidth can be used for astronomical photography in areas with severe light pollution.\u003cbr\u003e- Can effectively catch images of emission nebulae, planetary nebulae, and supernova remnants.\u003cbr\u003e- High transmittance and excellent out of band light cutoff can significantly improve the contrast and detail features of images when shooting deep space celestial bodies, effectively blocking the impact of light pollution on the shooting, and eliminating the interference of sodium lamps, mercury lamps, or night sky glow on the photographer.\u003cbr\u003e- Duo-narrowband filters are not suitable for visual observation and cannot be directly used for observing or capturing the sun.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.comseek.com\/image\/catalog\/87011\/87011-1.jpg\" style=\"width: 900px;\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"TeSeek Official Store","offers":[{"title":"1.25-inch","offer_id":47114441064684,"sku":"87011","price":39.0,"currency_code":"USD","in_stock":true},{"title":"2-inch","offer_id":47114441097452,"sku":"87012","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1718931727-5.jpg?v=1765880589"},{"product_id":"optolong-2-inch-l-quad-enhance-filter-4-channel-color-filter-for-continuous-spectral-target-light-polluted-environment","title":"Optolong 2-inch L-Quad Enhance Filter 4-Channel Color Filter for Continuous Spectral Target\/Light Polluted Environment","description":"\u003cp\u003e\u003cb\u003eOptolong 2-inch L-Quad Enhance Filter 4-Channel Color Filter for Continuous Spectral Target\/Light Polluted Environment\u003cbr\u003e\u003cbr\u003ePrecaution:\u003c\/b\u003e\u003cbr\u003e- Color: Due to environmental light, monitor color difference, and flash shooting, there may be some color difference in the product color. Please take the actual product as the standard.\u003cbr\u003e- Coating: The interference filter will present different colors under different light conditions, which is a normal phenomenon. Please take the actual product as the standard.\u003cbr\u003e- Style: In order to improve the product, changes in design\/appearance\/parameters have not been updated in a timely manner. Please take the actual product as the standard.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x 2-inch Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-1.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-2.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-3.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-4.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-5.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-6.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-7.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-8.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-9.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-10.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1048px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/86248\/86248-11.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47114422583532,"sku":"86248","price":142.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1703120690-6.jpg?v=1765878171"},{"product_id":"optolong-1-25-quot-l-enhance-dual-narrowband-filter-for-dslr-ccd-control-from-light-polluted-skies","title":"Optolong 1.25\" \/ 2\"  L-eNhance Dual Narrowband Filter for DSLR CCD Control from Light Polluted Skies","description":"\u003cp\u003e\u003cb\u003eOptolong 1.25\" \/ 2\" L-eNhance Dual Narrowband Filter for DSLR CCD Control from Light Polluted Skies\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003eThe relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.\u003cbr\u003e\u003cbr\u003eL-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas.\u003cbr\u003e\u003cbr\u003eOptolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eL-eNhance Filter Spectrum Curve:\u003c\/b\u003e\u003cbr\u003eAccording to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpectrum and Characteristics:\u003c\/b\u003e\u003cbr\u003e- Substrate: B270\u003cbr\u003e- Thickness: 1.85mm\u003cbr\u003e- Tpeak: T\u0026gt;90%\u003cbr\u003e- Blocking range: 300-1000nm\u003cbr\u003e- Blocking depth: light pollution line blocking \u0026gt;99.9%\u003cbr\u003e- Surface quality: 60\/40\u003cbr\u003e- Transmitted Wavefront RMS: λ\/4\u003cbr\u003e- Parallelism: 30s\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003cbr\u003e- 1 x Plastic Box\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":47114424910060,"sku":"82948","price":159.0,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":47114424942828,"sku":"82949","price":175.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1685409729-1.jpg?v=1765878277"},{"product_id":"optolong-l-extreme-1-25-quot-mounted-7nm-dual-narrowband-filter-accessory-for-dslr-and-ccd-cameras","title":"Optolong L-eXtreme 1.25\" Mounted 7nm Dual Narrowband Filter Accessory for DSLR and CCD Cameras","description":"\u003cp\u003e\u003cb\u003eOptolong L-eXtreme 1.25\" Mounted 7nm Dual Narrowband Filter Accessory for DSLR and CCD Cameras\u003cbr\u003e\u003cbr\u003eL-eXtreme Introduction:\u003c\/b\u003e\u003cbr\u003eL-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter.\u003cbr\u003e\u003cbr\u003eUnlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines.The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.\u003cbr\u003e\u003cbr\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life. Therefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpectrum and Characteristics:\u003c\/b\u003e\u003cbr\u003e- Substrate: B270\u003cbr\u003e- Thickness: 1.85mm\u003cbr\u003e- Tpeak: T\u0026gt;90%\u003cbr\u003e- Blocking range: 300-1000nm\u003cbr\u003e- Blocking depth: light pollution line blocking \u0026gt;99%\u003cbr\u003e- Surface quality: 60\/40\u003cbr\u003e- Transmitted Wavefront RMS: λ\/4\u003cbr\u003e- Parallelism: 30s\u003cbr\u003e\u003cbr\u003e\u003cb\u003eCoating Technology:\u003c\/b\u003e\u003cbr\u003e- Multi-layers anti-reflection coating\u003cbr\u003e- Non-cementing optical substrate coating\u003cbr\u003e- Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.\u003cbr\u003e- Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003cbr\u003e- 1.25\" (1 1\/4\" mounted) for eyepiece\u003cbr\u003e\u003cb\u003e\u003cbr\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Dual Narrowband Filter\u003cbr\u003e- 1 x Plastic Box\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47114422878444,"sku":"82946","price":193.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1755133056-3.jpg?v=1765880022"},{"product_id":"antlia-50mm-3nm-pro-oiii-astronomical-frameless-narrowband-filter-for-deep-space-photography","title":"ANTLIA 50mm 3nm Pro Astronomical Frameless Narrowband Filter for Deep Space Photography","description":"\u003cp\u003e\u003cb\u003eANTLIA 50mm 3nm Pro Astronomical Frameless Narrowband Filter for Deep Space Photography\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. H-alpha 3nm Pro filters are designed to deliver 88% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003cbr\u003e\u003cbr\u003e- Conventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics for Hyperstar and RASA.\u003cbr\u003e\u003cbr\u003e- The out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR (signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths. Improved sharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApplication and Performance:\u003c\/b\u003e\u003cbr\u003e- High transmittance and smallest bandwidth to maximize contrast.\u003cbr\u003e- Steep spectral profile minimizes halos around bright stars.\u003cbr\u003e- A single substrate to eliminate internal reflections.\u003cbr\u003e- Narrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants.\u003cbr\u003e- Use in light polluted areas and dark sites.\u003cbr\u003e- Extends imaging time when the moon is up.\u003cbr\u003e- Narrowband Pro filters can be used down to F\/3systemswith slight loss of signal.\u003cbr\u003e- All Narrowband filters are edge blackened to eliminate internal reflections from stray light.\u003cbr\u003e- Superior optical reliability reduces post image processing.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eTechnical Specifications:\u003c\/b\u003e\u003cbr\u003e- Basic substrate: Schott optical substrate\u003cbr\u003e- Filter thickness: 3mm+\/-0.05mm for Dia50mm unmounted\u003cbr\u003e- FWHM (Full width at half maximum): 3nm\u003cbr\u003e- CWL (Central Wavelength): 656.3nmnm\u003cbr\u003e- Peak transmission: \u0026gt;88%\u003cbr\u003e- Blocking: \u0026gt; 5 OD (0.001% out of band blocking) at 300-1000nm\u003cbr\u003e- Surface quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003cbr\u003e- Transmitted wavefront: Lambda\/4 or better\u003cbr\u003e- Parallelism: less than 30 arcsec\u003cbr\u003e- Single \/ Non-glued substrate\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePackage Included:\u003c\/strong\u003e\u003cbr\u003e- 1 x  Filter  or  \u003cspan style=\"color: #ff0000;\"\u003eFilter  Set ( for option)\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003eOIII 250-880nm:\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/100434\/100434-09.jpg\"\u003e\u003cbr\u003e\u003cbr\u003eOIII 600-700nm:\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/100434\/100434-10.jpg\"\u003e\u003cbr\u003e\u003cbr\u003eOIII 498-503nm:\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/100434\/100434-11.jpg\"\u003e\u003cbr\u003e\u003cbr\u003eOIII 250-880nm OD:\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/100434\/100434-12.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"OIII","offer_id":47180135596268,"sku":"100437","price":525.0,"currency_code":"USD","in_stock":true},{"title":"SII","offer_id":47180135629036,"sku":"100436","price":478.0,"currency_code":"USD","in_stock":true},{"title":"H-alpha","offer_id":47180135661804,"sku":"100435","price":478.0,"currency_code":"USD","in_stock":true},{"title":"H-alpha + SII + OIII","offer_id":47180135694572,"sku":"100434","price":1459.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/100434.jpg?v=1767844494"},{"product_id":"touptek-puresight-a1-2-inch-5nm-f-3-2-dual-narrowband-filters-ha-oiii-astronomical-filter-for-deepsky-photography","title":"ToupTek PureSight A1 2-inch 5NM F\/3.2 Dual Narrowband Filters Ha+OIII Astronomical Filter for Deepsky Photography","description":"\u003cp\u003e\u003cb\u003eToupTek PureSight A1 2-inch 5NM F\/3.2 Dual Narrowband Filters Ha+OIII Astronomical Filter for Deepsky Photography\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- Specially designed for color astronomical photography in high light hazardous environments.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-01.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e- 5nm ultra narrow full width at half maximum (FWHM), accurately passing through the Hα (656.3nm) and OII (500.7nm) core emission lines, penetrating the photodamage barrier.\u003cbr\u003e- Cut off depth of average OD5+, transmittance 0.001%; Effectively blocking 99.999% of non target spectral areas, effectively filtering out urban light pollution interference such as streetlights and neon lights.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-02.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e- The high-purity fused silica substrate and IAD ion assisted deposition coating process make the film compact and even, leaving the halo ghost behind.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-03.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e- The anti reflective film layer significantly reduces internal reflection and suppresses halo. The imaging background is pure and the star points are sharp.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-04.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e- 90%+ high transmittance, ≤30\" high parallelism, 60\/40 surface finish; balanced light control and transparency, clear presentation of nebula shadows and details. City balconies can also shoot pure deep space image quality.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-05.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e- Aluminum alloy matte black filter frame, solid and wear-resistant, effectively reduces stray light reflection.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-06.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e- For deep optimization of fast optical systems with F\/3.2 and above, stable performance can still be achieved at F\/2.8.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-07.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e- 2-inch size suitable for full frame and below color cameras. M48x0.75 standard thread easily connects to 2-inch 7-hole or 5-hole filter wheels and 2-inch filter drawers.\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-08.jpg\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Target spectral lines: Ha 656.3nm \u0026amp; OIII 500.7nm\u003cbr\u003e- FWHM (full width at half maximum): 5.0nm±1.2\/5.0nm±1\u003cbr\u003e- Peak transmittance: \u0026gt;90%\u003cbr\u003e- Cut off depth: better than average OD5 at 200-1100nm\u003cbr\u003e- Base material type: fused silica\u003cbr\u003e- Thickness: 2.00mm±0.1\u003cbr\u003e- Parallelism: ≤30”\u003cbr\u003e- Surface smoothness: 60\/40\u003cbr\u003e- Adaptive optical system: ≥F\/3.2\u003cbr\u003e- Coating process: IAD ion assisted deposition technology\u003cbr\u003e- Size: 2 inches (with filter frame, frame height 5mm, thread height 2mm)\u003cbr\u003e- Filter installation thread: M48 x 0.75\u003cbr\u003e- Filter frame material: aluminum alloy\u003cbr\u003e- Effective aperture: 43.9mm\u003cbr\u003e- Installation direction: thread side facing sensor\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Dual Narrowband Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-09.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 750px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101087\/101087-10.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ToupTek","offers":[{"title":"Default Title","offer_id":47406753349868,"sku":"101087","price":216.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1773717592-1.jpg?v=1773995595"},{"product_id":"touptek-sho-36mm-4nm-fwhm-narrowband-filter-set-sii-ha-oiii-astronomical-filter-for-deepsky-photography","title":"ToupTek SHO  2-inch\/36mm FWHM Narrowband Filter Set SII+Ha+OIII Astronomical Filter for Deepsky Photography","description":"\u003cp\u003e\u003cb\u003eToupTek SHO 2-inch\/36mm FWHM Narrowband Filter Set SII+Ha+OIII Astronomical Filter for Deepsky Photography\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- Narrowband filters are essential accessories in astrophotography, used to isolate specific wavelength emission lines and enhance target signal-to-noise ratio - particularly suitable for capturing spectacular emission nebulae.\u003cbr\u003e- SHO narrowband filters are precisely tuned to the three primary ionized emission lines of star-forming regions: Hα (656.3nm); SII (671.6nm); OIII (500.7nm)\u003cbr\u003e- By using these filters, you can effectively block urban light pollution and background stray light, significantly enhancing signal contrast and revealing incredible detail - enabling you to achieve Hubble-like palettes (SHO composites) in your astrophotography. \u003cbr\u003e\u003cbr\u003e\u003cb\u003eTechnical Parameters:\u003c\/b\u003e\u003cbr\u003e- Size: \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e36mm or  2-inch\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e- Glass thickness: 2mm\u003cbr\u003e- Transmittance: \u0026gt;90%\u003cbr\u003e- Glass material: Quartz Glass\u003cbr\u003e- Frame material: aluminum alloy\u003cbr\u003e- OD value: ≥5.0\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x SHO Filter Set\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101086\/101086-01.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101086\/101086-02.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101086\/101086-03.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101086\/101086-04.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101086\/101086-05.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101086\/101086-06.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101086\/101086-07.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ToupTek","offers":[{"title":"36mm","offer_id":47406767735020,"sku":"101086","price":398.0,"currency_code":"USD","in_stock":true},{"title":"2-inch 6.5NM","offer_id":47406767767788,"sku":"101083","price":336.0,"currency_code":"USD","in_stock":true},{"title":"2-inch 4NM","offer_id":47406767800556,"sku":"101082","price":605.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1773717456-1.jpg?v=1773995819"},{"product_id":"touptek-professional-36mm-lrgb-filter-set-rgb-three-channel-astronomical-filters-for-monochrome-cameras","title":"ToupTek Professional 2-inch\/36mm LRGB Filter Set RGB Three-channel Astronomical Filters for Monochrome Cameras","description":"\u003cp\u003e\u003cb\u003eToupTek Professional 2-inch\/36mm LRGB Filter Set RGB Three-channel Astronomical Filters for Monochrome Cameras\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- Engineered to overcome light pollution, empowering astrophotographers to reveal the true colors of the universe.\u003cbr\u003e- RGB three-channel filters are essential tools for monochrome astronomical cameras to shoot professional-grade images.\u003cbr\u003e- LRGB filters utilize advanced optical materials and precision coating technology to selectively transmit celestial radiation while blocking urban light pollution. This not only vividly reveals the authentic colors of the night sky but also significantly enhances image contrast.\u003cbr\u003e- Even faint celestial targets can display rich detail. Extremely low halo effects ensure every image maintains excellent fidelity, elevating your astrophotography to new heights.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eTechnical Parameters:\u003c\/b\u003e\u003cbr\u003e- Size: 36mm or \u003cspan\u003e2-inch\u003c\/span\u003e\u003cbr\u003e- Glass thickness: 2mm\u003cbr\u003e- Transmittance: \u0026gt;95%\u003cbr\u003e- Glass material: Quartz Glass\u003cbr\u003e- Frame material: aluminum alloy metal\u003cbr\u003e- OD value: ≥5.0\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x LRGB Filter Set\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-01.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-02.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-03.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-04.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-05.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-06.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-07.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101085\/101085-08.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ToupTek","offers":[{"title":"2-inch","offer_id":47406760919276,"sku":"101084","price":160.0,"currency_code":"USD","in_stock":true},{"title":"36mm","offer_id":47406760952044,"sku":"101085","price":115.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/101084.jpg?v=1773998234"},{"product_id":"optolong-l-synergy-2-inch-dual-7nm-sii-oiii-narrowband-filter-compatible-with-dslr-cameras-ccd-cameras","title":"OPTOLONG L-synergy 2-inch Dual 7nm SII+OIII Narrowband Filter Compatible with DSLR Cameras\/CCD Cameras","description":"\u003cp\u003e\u003cb\u003eL-synergy 2-inch Dual 7nm SII+OIII Narrowband Filter Compatible with DSLR Cameras\/CCD Cameras\u003cbr\u003e\u003cbr\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x L-synergy Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101249\/101249-01.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101249\/101249-02.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101249\/101249-03.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101249\/101249-04.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101249\/101249-05.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"OPTOLONG","offers":[{"title":"Default Title","offer_id":47465713926380,"sku":"101249","price":229.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1774594355-1.jpg?v=1775115543"},{"product_id":"optolong-l-extreme-2-inch-ha-oii-7nm-dual-band-pass-filter-compatible-with-dslr-cameras-ccd-cameras","title":"OPTOLONG L-extreme 2-inch Ha+OII 7nm Dual Band Pass Filter Compatible with DSLR Cameras\/CCD Cameras","description":"\u003cp\u003e\u003cb\u003eOPTOLONG L-extreme 2-inch Ha+OII 7nm Dual Band Pass Filter Compatible with DSLR Cameras\/CCD Cameras\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- L-extreme is a dual 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who are living in very light polluted areas, or when the moon is out, the L-extreme will be a good filter.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Sbustrate: B270\u003cbr\u003e- Thickness: 1.85mm\u003cbr\u003e- FWHM: OIII 7nm + Hα 7nm\u003cbr\u003e- Blocking range: 300-1000nm\u003cbr\u003e- Blocking depth: light pollution lines blocked \u0026gt; 99.9%\u003cbr\u003e- Surface quality: 60\/40\u003cbr\u003e- Wavefront RMS: λ\/4\u003cbr\u003e- Parallelism: 30''\u003cbr\u003e- Size: 2-inch\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x L-extreme Filter\u003c\/p\u003e","brand":"OPTOLONG","offers":[{"title":"Default Title","offer_id":47465714024684,"sku":"101250","price":218.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1774594381-1.jpg?v=1775115551"},{"product_id":"7nm-2-inch-ho-so-dual-narrow-band-astronomical-filter-for-color-cameras-with-m48x0-75-thread","title":"TeSeek 7NM 2-Inch HO\/SO Dual Narrow Band Astronomical Filter for Color Cameras with M48x0.75 Thread","description":"\u003cp\u003e\u003cb\u003eTeSeek 7NM 2-Inch HO\/SO Dual Narrow Band Astronomical Filter for Color Cameras with M48x0.75 Thread\u003cbr\u003e\u003cbr\u003eDescription:\u003c\/b\u003e\u003cbr\u003e- The 7nm HO\/SO narrowband filter is generally used in color cameras to filter out light pollution such as mercury lamps and sodium lamps in the environment, only passing through Ha (656.3nm), Oiii (500.7nm), Sii (672.4nm), thereby enhancing image contrast and signal-to-noise ratio, and shooting high contrast nebula images.\u003cbr\u003e- Compared to narrowband filters such as 3nm\/5nm, 7nm has a wider half bandwidth, making it more suitable for fast optical systems. Additionally, its excellent anti glare design allows users to produce images more quickly.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification:\u003c\/b\u003e\u003cbr\u003e- Size: 2-inch\u003cbr\u003e- Half bandwidth: 7nm±0.5nm\u003cbr\u003e- Centre wavelength: HO (500.7nm\/656.3nm); SO (500.7nm\/672.4nm)\u003cbr\u003e- Peak transmittance: Sii \u0026gt; 85%; Oiii \u0026gt; 85%; Ha \u0026gt; 90%\u003cbr\u003e- Cut-off depth: \u0026gt;0D4\u003cbr\u003e- Cut-off range: 200 - 1000nm\u003cbr\u003e- Filter thread: M48*0.75\u003cbr\u003e- Glass thickness: 2mm\u003cbr\u003e- Connector ring thickness: 5+2mm (thread thickness 2mm)\u003cbr\u003e- Recommended focus ratio: F2.8 - F16\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 2 x Filter\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101330\/101330-01.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/101330\/101330-02.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"TeSeek Official Store","offers":[{"title":"Default Title","offer_id":47499393827052,"sku":"101330","price":148.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1775008634-1.jpg?v=1775804925"},{"product_id":"svbony-sv220-multi-layer-coating-h-alpha-amp-oiii-dual-narrowband-filter-for-astronomical-telescope-3nm-1-25-inch","title":"SVBONY SV220 Multi-layer Coating  H-Alpha \u0026OIII \/ SII \u0026OIII  Dual Narrowband Filter for Astronomical Telescope","description":"\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- Multi-layer Coating Technology: Increase light transmittance, reduce light pollution, enhance target contrast, and improve image clarity.\u003cbr\u003e- High Transmittance 85%: The filter hardly loses any light, images are brighter, details are clearer.\u003cbr\u003e- M28.5 x 0.6 thread: It can be securely connected to most astronomical camera devices.\u003cbr\u003e- High-Contrast Astrophotography: Dual narrowband passbands at H-Alpha and O-III, with 3nm bandwidth for high contrast. \u0026gt;85% peak transmission captures faint details. Average OD5 blocks 99.999% stray light for clean images. Ideal for Astrophotography -- Superior for capturing clear, high-contrast deep-sky images even under light-polluted skies.\u003cbr\u003e- Minimal Halo Imaging: Anti-glare coating process effectively reduces halo and glare interference, ensuring the purity and delicacy of the image, especially suitable for photographing the starry sky and deep-sky celestial bodies.\u003cbr\u003e- Full-Frame Compatible (only 2 inches applicable): Full-frame design ensures no vignetting, broad field of view, and accurate color reproduction. It improves image uniformity, clarity, and contrast, ideal for high-res deep-sky observations, maintaining consistent quality across the frame.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-02.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-03.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-04.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-05.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-06.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-07.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-08.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-09.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-10.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-11.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-12.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102450\/102450-13.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"SVBONY","offers":[{"title":"3nm\/1.25-Inch \/ H-Alpha \u0026OIII","offer_id":47718015402220,"sku":"102450","price":112.0,"currency_code":"USD","in_stock":true},{"title":"3nm\/2-Inch \/ H-Alpha \u0026OIII","offer_id":47718015467756,"sku":"102451","price":272.0,"currency_code":"USD","in_stock":true},{"title":"7nm\/1.25-Inch \/ H-Alpha \u0026OIII","offer_id":47718015533292,"sku":"102452","price":56.0,"currency_code":"USD","in_stock":true},{"title":"7nm\/1.25-Inch \/ SII \u0026OIII","offer_id":47718015566060,"sku":"102454","price":260.0,"currency_code":"USD","in_stock":true},{"title":"7nm\/2-Inch \/ H-Alpha \u0026OIII","offer_id":47718015598828,"sku":"102453","price":128.0,"currency_code":"USD","in_stock":true},{"title":"7nm\/2-Inch \/ SII \u0026OIII","offer_id":47718015631596,"sku":"102455","price":416.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1779931021-1.jpg?v=1780022378"},{"product_id":"touptek-high-quality-2-inch-filter-drawer-with-m54-interface-for-astronomical-photography","title":"ToupTek High Quality 2-Inch Filter Drawer with M54 Interface for Astronomical Photography","description":"\u003cp\u003e\u003cb\u003eReminder:\u003c\/b\u003e\u003cbr\u003e- Please note,If the filter drawer is used with our OAG, it can ensure that there will be no visible light leakage after stretching under 600s exposure during the day, but if it is only used with other adapters, it is still necessary to use fillers to seal these corresponding screw holes.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter Drawer\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1024px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102719\/102719-01.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ToupTek","offers":[{"title":"Default Title","offer_id":47723451908332,"sku":"102719","price":43.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1780989187-1.jpg?v=1781063768"},{"product_id":"antlia-erf-dual-band-high-transmittance-astronomical-filter-25nm-fwhm-ha-amp-cak-cah-solar-filter-m48-0-75","title":"ANTLIA ERF Dual Band High Transmittance Astronomical Filter 25nm FWHM Ha\u0026amp;CaK\/CaH Solar Filter M48*0.75","description":"\u003cp\u003e\u003cb\u003eIntroduction:\u003c\/b\u003e\u003cbr\u003e- Adopting the latest process design with high transmittance, high cutoff, and flat top optimization, as well as advanced coating technology to ensure the accuracy of its wavelength.\u003cbr\u003e  T\u0026gt;95% at H-AIpha, FWHM 25nm\u003cbr\u003e  T\u0026gt;90% at CaK \u0026amp; CaH, FWHM 25nm\u003cbr\u003e- Blocking (200-1700nm): Ultra far design for UVIR cutoff. Due to the strong solar energy, the coating range is wider, from 200-1700nm, which blocks more of the solar energy in the infrared band. The out of band blocking design of OD4 (0.01%) at 300-1200nm is designed for safety considerations.\u003cbr\u003e- 1\/4 Lambda quartz substrate production: The filter uses a quartz substrate processed by secondary double-sided precision polishing. The 1\/4 Lambda waveform has better thermal stability, lower glass expansion coefficient, and denser film layer, which is less susceptible to environmental influences and has a longer service life. The 1\/4 Lambda waveform ensures that the impact of surface shape on image quality and wavelength on the image is minimized when paired with professional solar observation equipment.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102951\/102951-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102951\/102951-02.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102951\/102951-03.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/102951\/102951-04.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":47784450097388,"sku":"102951","price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1782350652-2.jpg?v=1782372460"},{"product_id":"antlia-high-quality-2-inch-hb-amp-o3-astronomical-filter-h-beta-oiii-for-deep-sky-visual-and-photography","title":"ANTLIA High Quality 2-Inch HB\u0026O3 Astronomical Filter H-Beta\/OIII for Deep Sky Visual and Photography","description":"\u003cp\u003e\u003cb\u003eIntroduction:\u003c\/b\u003e\u003cbr\u003e- HB\u0026amp;O3 filter for the visual and photography is a filter that can be used for both visual and photographic purposes. It allows high transmittance of three emission lines, OIII500.7nm, OIII 495.9nm, and H-Beta 486.1nm, with a pass rate of over 90%. Therefore, you can obtain good signals, which is very suitable for observing planetary nebulae, supernova remnants, emission nebulae, and diffuse nebulae. Compared with the visual filters on the market with a cut-off of 350-750nm and a cut-off of OD3, our filter exceeds the cut-off design of OD4 (0.001%) (300-1000nm), meeting the spectral requirements of photography cameras. It effectively blocks other stray light and infrared light interference, making the background darker and more effective. Improve the contrast of nebulae to make the target celestial body more \"three-dimensional\", which can be used in areas of light pollution and darkness, such as M27 Dumbbell Nebula, Veil Nebula, Orion Nebula, etc.\u003cbr\u003e- Due to the decreased sensitivity of the human eye at night, even in sensitive areas such as 500nm, we recommend using a large aperture telescope for observation to ensure sufficient light transmission for good visual results at night.\u003cbr\u003e- In addition, HB\u0026amp;O3 filter for the visual and photography can also be used in photography to highlight and enhance the details of OIII and H-Beta emission lines, making it suitable for deep sky shooting with Astro Camera and DSLR.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/103313\/103313-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 960px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/103313\/103313-02.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ANTLIA","offers":[{"title":"Default Title","offer_id":47951700033772,"sku":"103313","price":158.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1784013013-1.jpg?v=1784193666"},{"product_id":"nd3-0-astronomical-solar-filter-neutral-density-filter-nd-filter-for-transmission-reduction-1-25-inch","title":"Optolong ND3.0 Astronomical Solar Filter Neutral Density Filter ND Filter for Transmission Reduction","description":"\u003cp\u003e\u003cb\u003eIntroduction:\u003c\/b\u003e\u003cbr\u003e- Neutral Density (ND) filters are designed to reduce transmission evenly across a portion of a specific spectrum. ND filters are typically defined by their Optical Density (OD) which describes the amount of energy blocked by the filter. A high optical density value indicates very low transmission, and low optical density indicates high transmission (Equations 1-2). ND filters can be stacked to achieve a customs optical density. To calculate the final system OD, simply add the OD of each filter together.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e- Substrate: optical glass\u003cbr\u003e- Thickness: 1.85mm\u003cbr\u003e- T=0.1%\u003cbr\u003e- Surface quality: 60\/40\u003cbr\u003e- Transmitted Wavefront RMS: λ\/4\u003cbr\u003e- Parallelism: 30s\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePackage Included:\u003c\/b\u003e\u003cbr\u003e- 1 x Filter\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-01.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-02.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-03.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-04.jpg\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"width: 1000px;\" src=\"https:\/\/www.comseek.com\/image\/catalog\/103573\/103573-05.jpg\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25-Inch","offer_id":47980357255404,"sku":"103574","price":32.0,"currency_code":"USD","in_stock":true},{"title":"2-Inch","offer_id":47980357288172,"sku":"103573","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1784682744-1.jpg?v=1784692829"}],"url":"https:\/\/teseek.com\/collections\/filter.oembed?page=4","provider":"TeSeek Official","version":"1.0","type":"link"}