{"product_id":"baader-calcium-gen-ii-1-with-lpfc-cakii","title":"Baader Calcium GEN-II 1¼\" with LPFC (CaKII)","description":"\u003ch1\u003eBaader Calcium GEN-II 1¼\" with LPFC\u003c\/h1\u003e\n\u003cul\u003e\n\u003cli\u003eSingle filter (unstacked!), shows finest solar details in calcium K (Cak) lightFor solar photography only in combination with enclosed AstroSolar photo film ND3.8 or an Herschel prism (sold seperately: Baader Safety CoolCeramic Herschel Prism 2\" Photographic (#2956510P)\u003c\/li\u003e\n\u003cli\u003eEnhanced contrast matched to quantum efficiency and s\/n ratio of typical CMOS cameras.\u003c\/li\u003e\n\u003cli\u003eReflex-Blocker™ coatings, for maximum immunity to retro-reflection from nearest auxiliary optics, even under the most adverse conditions\u003c\/li\u003e\n\u003cli\u003eIdentical filter thickness to existing standards, with utmost care for homofocality\u003cbr\u003eReflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim\u003c\/li\u003e\n\u003cli\u003eSupplied with AstroSolar photo film ND 3.8, size: 200 x 290 mm - for pre-filtering sunlight\u003c\/li\u003e\n\u003cli\u003eThe calcium filter Gen-II must NOT be used in the light path WITHOUT pre-filtering.\u003c\/li\u003e\n\u003cli\u003eVisual observation is not possible with the calcium filter, as the eye is practically blind in this part of the spectrum. Never point the telescope directly at the sun with only the calcium filter (without an additional attenuation filter).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eCalcium GEN-II Filter 1¼\" with Low Profile Filtercell\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe calcium GEN-II filter lets you observe the interesting border region between the photosphere, which is visible in white light, and the chromosphere of the sun, which is reserved for narrow-band H-alpha filters. In addition to the structures known from white light, such as sunspots, you can see the chromospheric network distributed over the entire surface of the sun, which precedes the formation of sunspots, as well as cells of supergranulation and Ellerman Bombs.\u003c\/p\u003e\n\u003cp\u003eThe emission line of calcium at 394 nm is already in the near UV. That's why observing the sun at this wavelength is only possible with a camera! Never use this filter for visual observations, as our eye is blind for the harmful UV-radiation, but can be damaged by it.\u003c\/p\u003e\n\u003cp\u003eThis filter delivers the best results when used with a monochrome camera (which is more sensitive in this part of the spectrum than a colour camera) and mirror telescopes (because especially refractors with fast f\/ratios are not optimized for best sharpness in this part of the spectrum). Nevertheless, many lens telescopes still work fine for calcium observations; unmodified DSLRs may need extremely long exposure times.\u003c\/p\u003e\n\u003cp\u003eAll calcium-filters require an additional solar filter in front of them. Part of the Baader GEN-II is a sheet of AstroSolar Photo Film OD 3.8, 20x30 cm (#2459278) to build a solar filter by yourself, so that you can start observing without purchasing any other filters. Of course, you can also use one of the BDSF: Baader Digital Solar Filter OD 3.8 (80mm - 280mm) which are already mounted in a filter cell. On suitable lens telescopes, you can also use a Herschel prism. That way, you can replace the integrated ND3-filter mounted behind the Herschel with a weaker filter to reach shorter exposure times. These filters are already in the scope of delivery of the Baader Safety CoolCeramic Herschel Prism 2\" Photographic (#2956510P) .\u003c\/p\u003e\n\u003cp\u003eThe calcium GEN-II replaces the older K-Line Filter 1¼\" (stacked) # 2458355. Thanks to modern manufacturing techniques, a single filter now achieves a better quality and narrower half-band width (FWHM) of only 5 nm instead of the previous 8 nm; stacking two filters is now no longer necessary. This also makes it possible to use the filter in standard filter wheels\/drawers; the low-profile filter mount is only 6 mm high when screwed in.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Baader Calcium GEN-II 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-Blocker™ 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-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\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0267\/1172\/0013\/files\/02A-ED80-f7-5-Herschel-ND18-2961590A-01.jpg?v=1682191292\u0026amp;width=700\" alt=\"Baader Calcium GEN-II at ED 80\/600\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cem\u003eBaader Calcium GEN-II at ED 80\/600\u003c\/em\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0267\/1172\/0013\/files\/02A-Vixen-80-f11-Herschel-ND18-2961590A-02.jpg?v=1682191320\u0026amp;width=700\" alt=\"Baader Calcium GEN-II at 80\/910 Fraunhofer\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cem\u003eBaader Calcium GEN-II at 80\/910 Fraunhofer\u003c\/em\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003eTo use the 1¼\"-filter at cameras with 2\"-nosepiece, you can use either use a filter drawer like the Baader UFC System or a filter wheel. You can always use the filter thread of many barlow lenses as well as 1¼\" nose pieces like Baader 1¼\" T-2 nosepiece with Safety Kerfs (#2458106) . You can mount it between two parts with T-2-threads by combining Baader Double T-Filterholder 1¼\" (#1508030) and  Baader T-2Conversion Ring (#2958110) ; for cameras with a 2\" filter thread, you also need Baader Expanding Ring T-2f \/ M48m (T-2 part #29) (#2458110 .\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 cleaning.\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\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr class=\"first odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eSKU (#)\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003e2961590\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003e4047825048783\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003e0.108\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003eCaK-II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003e394 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eAR-COATING\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eSPECIAL FEATURES\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003eonly for photographic use behind another solar filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003e1 25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003eSolar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"odd\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd class=\"data last\" data-mce-fragment=\"1\"\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"last even\" data-mce-fragment=\"1\"\u003e\n\u003cth class=\"label\" data-mce-fragment=\"1\"\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd class=\"data last\" 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\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli\u003eCalcium GEN-II 1¼\" \u003c\/li\u003e\n\u003cli\u003e8 x 11\" sheet of AstroSolar Photo Film\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals \u003c\/h3\u003e\n\u003cp\u003eFAQ - Problems with filters can have the strangest causes\u003c\/p\u003e\n\u003cp\u003e2-Year Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":48411602845954,"sku":"eby1787937902821","price":239.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/3862\/0930\/files\/baader-calcium-gen-ii-1_-with-lpfc-cakii_1.webp?v=1787937912","url":"https:\/\/welcomingwillow.shop\/products\/baader-calcium-gen-ii-1-with-lpfc-cakii","provider":"My Store","version":"1.0","type":"link"}