{"product_id":"baader-h-alpha-bandpass-filter-20-nm","title":"Baader H-alpha Bandpass Filter (20 nm)","description":"\u003ch1\u003eBaader H-alpha Bandpass Filter (20 nm)\u003c\/h1\u003e\n\u003cdiv class=\"station-tabs-content is-active\" aria-hidden=\"false\" aria-labelledby=\"st-link-description_0-0\"\u003e\n\u003cdiv class=\"station-tabs-content-inner\"\u003e\n\u003cul\u003e\n\u003cli\u003eH-alpha filter with 20 nm FWHM (CWL 656.3 nm), thus excellently suited for visual use at night- and photographically with CCD and CMOS cameras at telescopes with all f-ratios. \u003cstrong\u003eWarning: this filter alone is not suitable for direct viewing of the sun!\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWith new, highly effective UV\/IR block coating from 300 nm to 1400 nm\u003c\/li\u003e\n\u003cli\u003eSimilar to the Super G filter in O III, the 20 nm H-alpha filter is an outstanding high-contrast deep-sky H-alpha\/red filter for RGB applications, optimised for all colour CCD and CMOS chips. It enables high-contrast images of H-II regions (e.g. North America nebulae) even from light-polluted environments.\u003c\/li\u003e\n\u003cli\u003eFront-Reflex-BlockerTM hard coated and planeoptically polished- with sealed coating edges (Life-CoatTM)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eH-alpha Bandpass-Filter (20 nm)\u003c\/h2\u003e\n\u003cp\u003eThis 20nm filter replaces the former 35nm H-alpha filter, which was developed for interline CCD cameras. Due to advances in sensor technology, now much narrower filters can be used with colour sensors.\u003c\/p\u003e\n\u003cp\u003eCompared to the CMOS-optimized Baader (Ultra) Narrowband Filters, the 20 nm H-alpha filter passes considerably more light. This makes the stars in the image brighter, allowing easier focusing, and the filter can be used at all focal ratios: There is no need for preshifting as with narrow band filters. This filter is especially interesting for users of colour cameras (which are less sensitive to red than monochrome cameras) who do not need extreme narrowband filters and want to enrich their colour images with H-alpha. At the same time this filter is a valid alternative to a standard R-filter of the RGB-scheme. It blocks much more of deteriorating light pollution and still passes all H-alpha for all focal ratios.\u003c\/p\u003e\n\u003cp\u003eA notable difference to all H-alpa pass filters on the market is the fact that this filter does include highly efficient UV\/IR blocking. being completely blocked out to 1400 nm, to eliminate blurring (\"heat-noise\") caused by defocused light on refractor optics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Baader H-alpha Bandpass Filter also offers all the advantages of the CMOS-optimized Baader filters:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreased contrast, matched for typical CMOS quantum efficiency and s\/n ratio\u003c\/li\u003e\n\u003cli\u003eReflex-BlockerTM coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics\u003c\/li\u003e\n\u003cli\u003eIdentical filter thickness to existing standards, with utmost care for parfocality\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter\u003c\/li\u003e\n\u003cli\u003eEach filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)\u003c\/li\u003e\n\u003cli\u003eLife-CoatTM: evermore hard coatings to enable a non-aging coating for life- even in a most adverse environment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e1.25\"\u003c\/p\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"data-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSKU (#)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2961850\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4047825053824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eH-alpha\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e656,3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eAR-COATING\u003c\/th\u003e\n\u003ctd class=\"data\"\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eCMOS, CCD, H-alpha, IR-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e2\"\u003c\/p\u003e\n\u003ctable style=\"width: 99.9768%; height: 333.2px;\" id=\"product-attribute-specs-table\" class=\"data-table\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eSKU (#)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e2961853\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e4047825053831\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e0.012\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eH-alpha\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 39.2px;\" class=\"label\"\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 39.2px;\" class=\"data\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e20nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e656,3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 39.2px;\" class=\"label\"\u003eAR-COATING\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 39.2px;\" class=\"data\"\u003eReflex-BlockerTM hard coated, dielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eCMOS, CCD, H-alpha, IR-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e-Baader H-alpha Bandpass Filter (20 nm)\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003eBaader 2-Year Warranty\u003cbr\u003eProblems with filters can have the strangest causes\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\"","offer_id":54478625898780,"sku":"qwy1787937839414","price":74.26,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":54478625931548,"sku":"sbs1787937839415","price":137.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0926\/7078\/7868\/files\/baader-h-alpha-bandpass-filter-20-nm_1.webp?v=1787937849","url":"https:\/\/www.blossomandbay.shop\/products\/baader-h-alpha-bandpass-filter-20-nm","provider":"My Store","version":"1.0","type":"link"}