{"product_id":"baader-c2-swan-band-filter-15nm-oiii-parallel-fswan","title":"Baader C2 Swan-Band Filter (15nm) – OIII Parallel (FSWAN)","description":"\u003ch1\u003eBaader C2 Swan-Band Filter (15nm) – OIII Parallel\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComet filter for the two brightest C2 emission lines at 511 and 514nm (called \"Swan-Band\") in the gas tail and gasplume of comets, respectively\u003c\/li\u003e\n\u003cli\u003eBlocks the adjacent OIII line, which does not predominantly occur in the tail of comets\u003c\/li\u003e\n\u003cli\u003eCMOS optimized for increased contrast\u003c\/li\u003e\n\u003cli\u003eFront-Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003cp\u003eThe SwanBand filter is indeed a very special filter with central wavelength at 512 nm and ≤15nm half-width -\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003efor the first time without any O III transmission.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIt is therefore suitable for a variety of unusual applications some of which require further investigation, whether as an \"O III parallel filter\" to better remove stars from the image, or as a solar filter in a previously inaccessible section of the spectrum. We would be pleased about your experience reports also apart from the comet photography.\u003c\/p\u003e\n\u003ch2\u003eContrast gain for comet hunters\u003c\/h2\u003e\n\u003cp\u003eThe Baader C2 SWAN-Band-Filter with ≤ 15 nm Half-Band-Width isolates the two C2 lines at 511 and 514nm.\u003c\/p\u003e\n\u003cp\u003eThese two emission lines, named Swan bands after their discoverer, dominate the spectrum of a comet's gas tail in the visible range. The filter allows only the light from the two carbon bands to pass through and, among other things, blocks the ubiquitous stray light, similar to a nebula filter in deep-sky observation. Structures in the gas tail thus become clearer even under good observing conditions. At the same time, it completely blocks the OIII line at 501nm and below, which other Swan-Band filters allow to pass. This allows for even higher contrast, and comets with gas tails can be distinguished even better from those dominated by a dust tail (and where a SWAN filter provides only a small contrast enhancement). For ambitious comet observers, a SWAN filter is part of the basic equipment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Baader SWAN-Filter has got all the advantages of the CMOS-optimized Baader filters:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCMOS-Optimized Baader Filter\u003c\/li\u003e\n\u003cli\u003eIncreased contrast\u003c\/li\u003e\n\u003cli\u003eEver more narrow passbands\u003c\/li\u003e\n\u003cli\u003eReflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics\u003c\/li\u003e\n\u003cli\u003eFWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s\/n ratio\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-Coat™: 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\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch2\u003e1.25\"\u003c\/h2\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\"\u003e2961860\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4047825054128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0,006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e≤ 505 – 520 nm\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\"\u003e≤ 15nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e513 nm (for the C2 lines at 511 and 514nm)\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\"\u003eGas evolution of comets, O-III-paralel Imaging, Contrast Enhancement\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\"\u003eBandpass\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\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003ch2\u003e2\"\u003c\/h2\u003e\n\u003ctable class=\"data-table\" id=\"product-attribute-specs-table\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eSKU (#)\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e2961863\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e4047825054135\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e0.012\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e≤ 505 – 520 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e≤ 15nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e513 nm (for the C2 lines at 511 and 514nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eAR-COATING\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003eGas evolution of comets, O-III-paralel Imaging, Contrast Enhancement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd class=\"data\" data-mce-fragment=\"1\"\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003eBaader 2 year warranty : Returns and Warranty Policies — Alpine Astronomical LLC\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLimited-Lifetime-Warranty for CMOS-optimized Baader filters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA Baader Planetarium exclusive. Filters incorporating Baader Planetarium’s Life-Coat™ technology are so durable that Baader Planetarium warrants the coatings for the life of the filter. Baader Planetarium has developed Life-Coat™ using materials and processes that result in coatings which will not degrade or fail for a lifetime. Life-Coat™ coatings resist moisture, temperature extremes, and are hardened to withstand normal cleanings.\u003c\/p\u003e\n\u003cp\u003eBaader Planetarium guarantees their Life-Coat™ coatings will not peel, flake or physically degrade and will withstand repeated cleaning with fine optical cleaning equipment. The Limited Lifetime Warranty applies to the original purchaser and does not cover failure from misuse, physical damage through improper handling, or improper clea\u003c\/p\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25 inch","offer_id":52384155074780,"sku":"yvu1787937784162","price":61.2,"currency_code":"USD","in_stock":true},{"title":"2 inch","offer_id":52384155107548,"sku":"dwq1787937784163","price":112.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0758\/5592\/1372\/files\/baader-c2-swan-band-filter-15nm-oiii-parallel-fswan_1.webp?v=1787937790","url":"https:\/\/www.simpledaystore.shop\/products\/baader-c2-swan-band-filter-15nm-oiii-parallel-fswan","provider":"My Store","version":"1.0","type":"link"}