{"product_id":"antlia-2x-barlow-lens-for-5-cak-solar-filter","title":"Antlia 2x Barlow Lens for 5Å CaK Solar Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2x Magnification\u003c\/li\u003e\n\u003cli\u003eDesigned Specifically for the Antlia Solar Discover 5Å CaK Assembly\u003c\/li\u003e\n\u003cli\u003eEnhances Detail for Solar Photography\u003c\/li\u003e\n\u003cli\u003eAvailable Pre-Installed or Ordered Separately\u003c\/li\u003e\n\u003cli\u003eOptional 50mm and 70mm Extension Tubes for Extra Back Focus\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\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 2x Barlow Lens for 5Å CaK Solar Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Antlia 2x Barlow Lens is designed as a dedicated optical component for the Antlia 5Å CaK Solar Filter assembly. Antlia says it enhances detail when used, optimizing performance for solar photography in the narrow 5Å Calcium-K line, where plages are a prominent feature.\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\u003eA 2x Barlow Optimized for the Antlia 5Å CaK Filter\u003c\/h3\u003e\n      \u003cp\u003eAntlia designed this Barlow specifically for the Antlia Solar Discover 5Å CaK assembly. By doubling the effective focal length of your telescope, it enlarges the solar image so that small chromospheric features cover more pixels on your camera. You can order this 2x Barlow pre-installed in a new CaK assembly or purchase it separately to upgrade an existing setup.\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\u003eAchieving Focus with Optional 50mm and 70mm Extension Tubes\u003c\/h3\u003e\n      \u003cp\u003eAdding a Barlow lens to an imaging train moves the focus point, which can require additional back focus. Antlia offers optional 50mm and 70mm extension tubes to achieve more back focus if needed when using the 5Å CaK assembly with a Barlow, helping the system reach focus. They are not included with the Barlow and are ordered separately.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\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 do I need this specific Antlia 2x Barlow for my 5Å CaK filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis Barlow is not a general-purpose accessory; it is optically matched to the \u003cstrong\u003eAntlia Solar Discover 5Å CaK assembly\u003c\/strong\u003e. Antlia says it enhances detail and optimizes performance for solar photography, doubling your image scale for finer details like solar plages.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know if I need the optional 50mm or 70mm extension tubes for the Antlia 2x Barlow?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou will need an extension tube if you cannot achieve focus after installing the Barlow lens. If your focuser reaches the end of its outward travel before the image is sharp, one of the optional \u003cstrong\u003e50mm or 70mm extension tubes\u003c\/strong\u003e gives the extra back focus Antlia provides them for.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Antlia 2x Barlow help my 5Å CaK images in an 80mm refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhen used with the Antlia Solar Discover 5Å CaK assembly on an 80mm refractor, the \u003cstrong\u003eAntlia 2x Barlow\u003c\/strong\u003e doubles the image scale. This lets your camera's pixels better sample small features such as plages, which may be too small at the telescope's native focal length. An 80mm refractor is within Antlia's 100mm limit for use without extra light reduction.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between ordering the Antlia 2x Barlow pre-installed versus separately?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eOrdering the Barlow \u003cstrong\u003epre-installed\u003c\/strong\u003e means you order the Antlia Solar Discover 5Å CaK assembly with the Barlow already installed. Ordering it \u003cstrong\u003eseparately\u003c\/strong\u003e is the option if you already own the CaK filter assembly and wish to add the 2x magnification capability to your existing setup.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Antlia 2x Barlow for visual solar observing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This Barlow is designed for \u003cstrong\u003esolar photography\u003c\/strong\u003e with the Antlia Solar Discover 5Å CaK assembly. Antlia does not recommend the Solar Discover 5Å CaK assembly for visual observation; it is primarily used for solar imaging. Use it for imaging only.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Antlia 2x Barlow with other solar filters, like a Hydrogen-Alpha etalon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAntlia designs this Barlow specifically for the \u003cstrong\u003eAntlia Solar Discover 5Å CaK assembly\u003c\/strong\u003e and states no other use, so we do not recommend it with other filters such as an H-alpha etalon.\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\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e2X\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eDesigned specifically for the Antlia Solar Discover 5Å CaK assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePurchasing Options\u003c\/td\u003e\n\u003ctd\u003eCan be ordered separately or pre-installed in the Solar Discover 5Å CaK assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocusing Accessory\u003c\/td\u003e\n\u003ctd\u003eOptional 50mm and 70mm extension tubes available for extra back focus\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e2X\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\"\u003eAntlia 2x Barlow Lens Component\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\nContact us for warranty details.\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":51932625305885,"sku":"ANT-BARLOW-CAK5A-2X","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-src-owZmv8QYw0gY40wY_b18e3a3d-397d-475d-a148-9e722ef93b8b.png?v=1792550006","url":"https:\/\/davidastro.com\/fr-int\/products\/antlia-2x-barlow-lens-for-5-cak-solar-filter","provider":"David Astro","version":"1.0","type":"link"}