{"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","url":"https:\/\/teseek.com\/fr\/products\/touptek-puresight-a1-2-inch-5nm-f-3-2-dual-narrowband-filters-ha-oiii-astronomical-filter-for-deepsky-photography","provider":"TeSeek Official","version":"1.0","type":"link"}