{"product_id":"antlia-solar-discover-3nm-cak-filter-assembly","title":"Antlia Solar Discover 3nm CaK Filter Assembly","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the 393.3nm Calcium-K emission line for high-contrast solar imaging\u003c\/li\u003e\n\u003cli\u003eUltra-narrow 3nm bandpass designed to maximize imaging contrast of sunspots and granulation\u003c\/li\u003e\n\u003cli\u003eOD5 (0.001%) blocking; refractors up to 100mm only without extra light reduction\u003c\/li\u003e\n\u003cli\u003eFilters assembled in a fully closed CNC-machined tube, so no stray light escapes\u003c\/li\u003e\n\u003cli\u003eDesigned with 1.25\" and 2\" adapters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eAntlia Solar Discover 3nm CaK Filter Assembly\u003c\/h2\u003e\n      \u003cp\u003eThe Antlia Solar Discover 3nm CaK Filter Assembly isolates the critical 393.3nm Calcium-K line with an ultra-narrow 3nm bandpass designed to maximize imaging contrast of sunspots, solar surface granulation and other features prominent in CaK light. Its OD5 (0.001%) blocking is intended to reduce most solar heat ingress, and one set of light-reducing filters is built into the closed tube. Without extra light reduction it may only be used with \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e up to 100mm aperture.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e3nm CaK Imaging at 393.3nm for Maximum Contrast\u003c\/h3\u003e\n      \u003cp\u003eBy targeting the specific 393.3nm wavelength of the Calcium II K-line, this assembly reveals a different layer of the sun's atmosphere than white-light or H-alpha filters. The ultra-narrow 3nm bandpass is designed to maximize imaging contrast of solar surface granulation, sunspots and other features prominent in CaK light, such as bright faculae near the solar limb.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eOD5 Blocking and the 100mm Refractor Aperture Limit\u003c\/h3\u003e\n      \u003cp\u003eThe built-in 3nm CaK filter has a high blocking specification of OD5 (0.001%), intended to reduce most solar heat ingress, and the assembly adds one set of light-reducing filters. Without an extra light reduction solution, the Solar Discover 3nm CaK can only be used with refractors up to 100mm aperture. With any telescope above 100mm aperture, additional light reduction is required for safe operation, such as ERF filters, solar safety films, or lowering the telescope aperture.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEnclosed Optical Path:\u003c\/strong\u003e The filters are housed in a fully closed tube, so no stray light can escape.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eZenith Mirror Use:\u003c\/strong\u003e When you use a zenith mirror, the ERF filter must be installed in the correct position for safe operation. Follow Antlia's installation diagram.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDisassembly Prohibited:\u003c\/strong\u003e Disassembling the assembly is prohibited and voids the 3-year warranty. Repairs, returns and exchanges are not accepted once it has been disassembled.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCNC-Machined Housing with 1.25\" and 2\" Adapters\u003c\/h3\u003e\n      \u003cp\u003eThe assembly is built into a metal tube CNC-machined from aircraft aluminum and oxidized. Installation is similar to the Antlia CaK 3nm Solar \u003ca href=\"\/collections\/herschel-wedges\"\u003eHerschel Wedge\u003c\/a\u003e: the telescope attaches to one end and your camera to the other. Antlia designed 1.25'' and 2'' adapters for the assembly.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSolar Discover Assembly vs. Antlia CaK Solar Herschel Wedge\u003c\/h3\u003e\n      \u003cp\u003eAntlia's CaK 3nm Solar Herschel Wedge already has its CaK 3nm filter screwed in. Compared with the wedge, the Solar Discover 3nm CaK assembly has a new tube structure design, is designed with 1.25'' and 2'' adapters, and adds light-reducing filters.\u003c\/p\u003e\n      \u003cp\u003eThe 3nm CaK filter and the light-reducing filters are assembled in a fully closed tube, and installation is similar to the wedge, with the telescope at one end and the camera at the other.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eImaging Only: Why the 393.3nm Line is Not for Visual Use\u003c\/h3\u003e\n      \u003cp\u003eThe Solar Discover 3nm CaK assembly is primarily used for solar imaging and is not recommended for visual observation. The 393.3nm wavelength sits at the extreme violet edge of the visible spectrum and is almost invisible to the human eye, so many people find it difficult to see the information CaK has to offer.\u003c\/p\u003e\n      \u003cp\u003eIn addition, the IR coating range of the assembly is slightly different from the ISO 12312-2 Standard for \u003ca href=\"\/collections\/eclipse-glasses-and-viewers\"\u003eSolar Viewers\u003c\/a\u003e. For tough technical requirements and safety considerations, Antlia does not recommend it for visual observation, and stresses that all filters built into the assembly must be in good condition for safety. Use it with a camera.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Antlia Solar Discover 3nm CaK not recommended for visual observation?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e393.3nm CaK wavelength\u003c\/strong\u003e is at the very edge of the human visual range and is almost invisible to the eye, so most people cannot see the solar detail CaK offers. Its IR coating range also differs slightly from the ISO 12312-2 Standard for Solar Viewers, and Antlia does not recommend it for visual observation for technical and safety reasons. Use it with a camera.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do I need to use the Antlia Solar Discover CaK with my 120mm refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBecause your telescope's aperture is greater than \u003cstrong\u003e100mm\u003c\/strong\u003e, Antlia requires an additional light reduction solution for safe operation, such as ERF filters, solar safety films, or lowering the telescope aperture. If you also use a zenith mirror, the ERF must be installed in the correct position shown in Antlia's installation diagram.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat solar features will the Antlia Solar Discover 3nm CaK assembly reveal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis assembly is designed to maximize imaging contrast of features prominent in CaK light, such as:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSolar Surface Granulation:\u003c\/strong\u003e The \"rice grain\" texture of the photosphere.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSunspots:\u003c\/strong\u003e Named by Antlia as a target.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFaculae:\u003c\/strong\u003e Bright, blotchy regions that are most prominent near the solar limb.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Antlia Solar Discover assembly differ from a CaK Solar Herschel Wedge?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Antlia CaK 3nm Solar Herschel Wedge has its CaK 3nm filter screwed in. Compared with it, the Solar Discover assembly has a new tube structure design, is designed with 1.25'' and 2'' adapters, and adds light-reducing filters, all in a fully closed tube. Installation is similar: telescope at one end, camera at the other.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Antlia Solar Discover 3nm CaK with my 8\" SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWithout extra light reduction, Antlia allows only \u003cstrong\u003erefractors up to 100mm\u003c\/strong\u003e aperture. For any telescope above 100mm aperture, Antlia requires additional light reduction for safe operation, such as ERF filters, solar safety films, or lowering the telescope aperture. Antlia does not name \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain telescopes\u003c\/a\u003e, so contact us before using it with one.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs it safe to disassemble the Antlia Solar Discover assembly for cleaning?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Disassembly of the assembly is prohibited and voids the \u003cstrong\u003e3-year warranty\u003c\/strong\u003e. Repairs, returns and exchanges are not accepted once it has been disassembled. Contact us if you have a question about its condition.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSolar imaging filter assembly (Calcium II K-line)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBuilt-in Filter\u003c\/td\u003e\n\u003ctd\u003e3nm ultra narrow bandpass, centered on CaK 393.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003eOD5 (0.001%) out of band\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight Reduction\u003c\/td\u003e\n\u003ctd\u003eOne set of integrated light-reducing filters in a fully closed tube\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAdapters\u003c\/td\u003e\n\u003ctd\u003e1.25'' and 2'' adapters designed for the assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTelescope Aperture Limit\u003c\/td\u003e\n\u003ctd\u003eRefractors up to 100mm without extra light reduction; above 100mm use ERF filters, solar safety film or a reduced aperture\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVisual Use\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eCNC-machined aircraft aluminum, oxidized finish\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTransmittance (UVB 280-315nm)\u003c\/td\u003e\n\u003ctd\u003eTmax 0.0032%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTransmittance (UVA 315-380nm)\u003c\/td\u003e\n\u003ctd\u003eTmax 0.0032%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTransmittance (Visible 380-780nm)\u003c\/td\u003e\n\u003ctd\u003eTmax 0.0032%, Tmin 0.000061%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTransmittance (IR 780-1700nm)\u003c\/td\u003e\n\u003ctd\u003eTmax 3%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e3-years (voided if disassembled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e393.4 nm (Calcium K)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eSolar Discover 3nm CaK assembly\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003eIncludes built-in 3nm CaK filter and light-reducing filters\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n3-Year Manufacturer Warranty from Antlia. Disassembly of the assembly is strictly prohibited and voids the warranty.\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"3nm CaK","offer_id":51932625207581,"sku":"ANT-SD-CAK3NM","price":503.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-src-oi7u2pAYw6Ac46Ac_b3310317-388c-4978-a90b-79ba6acd8dd7.jpg?v=1792550005","url":"https:\/\/davidastro.com\/products\/antlia-solar-discover-3nm-cak-filter-assembly","provider":"David Astro","version":"1.0","type":"link"}