{"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":"TeSeek Official","offers":[{"title":"Default Title","offer_id":47784450097388,"sku":"102951","price":118.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9669\/3740\/files\/1782350652-2.jpg?v=1782372460","url":"https:\/\/teseek.com\/ja\/products\/antlia-erf-dual-band-high-transmittance-astronomical-filter-25nm-fwhm-ha-amp-cak-cah-solar-filter-m48-0-75","provider":"TeSeek Official","version":"1.0","type":"link"}