{"product_id":"optolong-night-sky-h-alpha-filter","title":"Optolong Night Sky H-Alpha filter (IR-Pass 650nm)","description":"\u003ch2\u003eOptolong Night Sky H-Alpha filter\u003c\/h2\u003e\n\u003cp\u003eNight Sky H-Alpha filter (IR Pass 650nm) with 50% transition from blocking to passing at about 640nm and 95% or above transmission at wavelengths longer than 650nm can be used in IR-LRGB imaging to produce a sharper luminance image for the best planetary contrast as atmospheric seeing and distortion is much reduced at longer IR wavelengths.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range including infrared wavelengths. Thus RGB planetary images taken with IR as the luminance channel have visible-enhanced contrast and surface detail than standard LRGB images.\u003c\/p\u003e\n\u003cp\u003eWARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eSubstrate: Optical glass\u003cbr\u003eThickness: 1.85mm\u003cbr\u003eTave:  T\u0026gt;90%\u003cbr\u003eBlocking range: 300-570nm\u003cbr\u003eSurface quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism: 30s\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-ll-status=\"loaded\" class=\"lazyloaded\" alt=\"\" src=\"https:\/\/optolong.com\/uploads\/images\/20201125\/afe8c3f4e4eb968ef68dd5839b667b29.png\" width=\"532\" height=\"347\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp\u003e▲The RED line shows the transmission of the Night Sky H-Alpha filter.\u003c\/p\u003e\n\u003ch3\u003eIn The Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697758830821,"sku":"OL-NSHA-1","price":111.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697758863589,"sku":"OL-NSHA-2","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-night-sky-h-alpha-filter-ir-pass-650nm-astronomy-plus_9a5d747f-d16c-4d12-8485-0e83f2bbc979.png?v=1690487288","url":"https:\/\/istronomyplus.com\/products\/optolong-night-sky-h-alpha-filter","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}