{"product_id":"baader-filtro-h-alpha-ultra-narrowband-3-5nm","title":"Baader H-alpha Ultra-Narrowband Filter 3.5nm","description":"\u003cp\u003e\u003cstrong\u003eThe Baader H-alpha Ultra-Narrowband Filter 3.5nm\u003c\/strong\u003e is the even narrower-band version compared to the standard Narrowband (6.5nm), designed for maximum possible contrast even under heavily light-polluted skies (Bortle 9\/8\/7\/6).\u003c\/p\u003e\n\n\u003ch2\u003eWhat it's for\u003c\/h2\u003e\n\u003cp\u003eLinear filter with a 3.5nm FWHM passband, recommended for optical systems from f\/10 to f\/3.5. Compared to the standard Narrowband version, the narrower passband allows for even greater contrast, further reduces the apparent size of stars and reveals the finest details of emission nebulae — essential under heavy urban light pollution.\u003c\/p\u003e\n\n\u003ch2\u003eBaader CMOS-Optimized technology\u003c\/h2\u003e\n\u003cp\u003eThe filter is coated with \u003cstrong\u003eReflex-Blocker™\u003c\/strong\u003e treatment, which eliminates unwanted reflections even in the presence of auxiliary optics, and with \u003cstrong\u003eLife-Coat™\u003c\/strong\u003e technology: a hardened coating that does not flake, does not degrade and lasts the filter's entire lifetime even under the most extreme conditions. The edges are blackened all around, with a visual indicator on the front side for correct orientation during mounting. The filter is individually polished and coated, with no exposed coating edges.\u003c\/p\u003e\n\n\u003ch2\u003eAvailable formats\u003c\/h2\u003e\n\u003cp\u003eAvailable in 7 formats: 1¼\" (31.8mm), 2\" (50.8mm), 31mm, 36mm, 50.4mm, 50×50mm and 65×65mm.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eH-alpha Ultra-Narrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral wavelength\u003c\/td\u003e\n\u003ctd\u003e656.3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM)\u003c\/td\u003e\n\u003ctd\u003e3.5 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended optical systems\u003c\/td\u003e\n\u003ctd\u003ef\/10 to f\/3.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter thickness\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eReflex-Blocker™, Life-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWho it's for\u003c\/h2\u003e\n\u003cp\u003eIdeal for astrophotographers working under heavily light-polluted skies who want the maximum possible contrast for H-alpha imaging, or for those who want to purchase the individual filters of the SHO palette separately to complete or replace an existing set. Compatible with filter wheels and most mono CMOS cameras.\u003c\/p\u003e","brand":"Baader-Planetarium","offers":[{"title":"1¼\" (31,8mm)","offer_id":58482387321163,"sku":"BRBP2961325","price":285.0,"currency_code":"EUR","in_stock":true},{"title":"2\" (50,8mm)","offer_id":58482395382091,"sku":"BRBP2961328","price":409.0,"currency_code":"EUR","in_stock":true},{"title":"31mm","offer_id":58482395414859,"sku":"BRBP2961326","price":300.0,"currency_code":"EUR","in_stock":true},{"title":"36mm","offer_id":58482395447627,"sku":"BRBP2961327","price":360.0,"currency_code":"EUR","in_stock":true},{"title":"50,4mm","offer_id":58482395480395,"sku":"BRBP2961329","price":446.0,"currency_code":"EUR","in_stock":true},{"title":"50x50mm","offer_id":58482395513163,"sku":"BRBP2961330","price":511.0,"currency_code":"EUR","in_stock":true},{"title":"65x65mm","offer_id":58482395545931,"sku":"BRBP2961331","price":640.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/baader-filtro-h-alpha-ultra-narrowband-35nm-114pollice.jpg?v=1789497157","url":"https:\/\/adriasky.it\/en\/products\/baader-h-alpha-ultra-narrowband-filter-3-5nm","provider":"Adriasky","version":"1.0","type":"link"}