{"product_id":"baader-set-filtri-ultra-narrowband-3-5-4nm-1-25-sho","title":"Baader Ultra-Narrowband Filter Set 3.5\/4nm 1.25\" (H-alpha\/O-III\/S-II)","description":"\u003cp\u003e\u003cstrong\u003eThe Baader Ultra-Narrowband Filter Set 3.5\/4nm 1.25\" (H-alpha \/ O-III \/ S-II)\u003c\/strong\u003e is the even narrower-band version of the Baader CMOS-Optimized range, designed for maximum contrast even under strongly light-polluted skies (Bortle 9\/8\/7\/6), for tri-color imaging of emission nebulae in the \"Hubble\" palette (SHO).\u003c\/p\u003e\n\n\u003ch2\u003eThree filters, ultra-narrow bandwidth\u003c\/h2\u003e\n\u003cp\u003eThe set includes an \u003cstrong\u003eH-alpha\u003c\/strong\u003e filter (656.3nm, 3.5nm FWHM), an \u003cstrong\u003eO-III\u003c\/strong\u003e filter (500.7nm, 4nm FWHM) and an \u003cstrong\u003eS-II\u003c\/strong\u003e filter (671.7nm, 4nm FWHM), optimized for optical systems from f\/10 to f\/3.5. Compared to the standard Narrowband version (6.5nm), the narrower bandwidth allows even greater contrast, further reduces apparent star size, and reveals the finest nebula details — essential under strong urban light pollution.\u003c\/p\u003e\n\n\u003ch2\u003eBaader CMOS-Optimized technology\u003c\/h2\u003e\n\u003cp\u003eEach 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 peel, degrade, and lasts the entire life of the filter even in the most extreme conditions. The edges are blackened all around, with a visual indicator on the front side for correct orientation during mounting. Each filter is individually polished and coated, with no exposed coating edges.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\u003cth\u003eParameter\u003c\/th\u003e\u003cth\u003eValue\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eFilters included\u003c\/td\u003e\u003ctd\u003eH-alpha, O-III, S-II\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCentral wavelengths\u003c\/td\u003e\u003ctd\u003e656.3 \/ 500.7 \/ 671.7 nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eBandwidth (FWHM)\u003c\/td\u003e\u003ctd\u003e3.5 \/ 4 nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eFormat\u003c\/td\u003e\u003ctd\u003e1.25\" (31.8mm), M28.5 thread\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eRecommended optical systems\u003c\/td\u003e\u003ctd\u003ef\/10 to f\/3.5\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eFilter thickness\u003c\/td\u003e\u003ctd\u003e2 mm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCoating\u003c\/td\u003e\u003ctd\u003eReflex-Blocker™, Life-Coat™\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eBrand\u003c\/td\u003e\u003ctd\u003eBaader Planetarium\u003c\/td\u003e\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 under strongly light-polluted skies who want maximum contrast for false-color images in the \"Hubble Palette\" style of emission nebulae, planetary nebulae and supernova remnants. Compatible with 1.25\" filter wheels and most monochrome CMOS cameras for astrophotography.\u003c\/p\u003e","brand":"Baader-Planetarium","offers":[{"title":"Default Title","offer_id":57946541359435,"sku":"BRBP2961670","price":773.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/Baader-Filters-H-alpha-OIII-SII-CMOS-Ultra-Narrowband-1-25_88e2d124-7c77-4a51-a7f1-f884daa1e155.jpg?v=1785071445","url":"https:\/\/adriasky.it\/en\/products\/baader-ultra-narrowband-filter-set-3-5-4nm-1-25-sho","provider":"Adriasky","version":"1.0","type":"link"}