{"product_id":"antlia-extension-tube-for-solar-discover-cak-assembly-50mm","title":"Antlia Extension Tube for Solar Discover CaK Assembly - 50mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50mm extension tube for more back focus\u003c\/li\u003e\n\u003cli\u003eOffered for the Antlia Solar Discover 5Å CaK assembly\u003c\/li\u003e\n\u003cli\u003eHelps reach focus when the 5Å CaK assembly is used with a Barlow lens\u003c\/li\u003e\n\u003cli\u003eAvailable in 50mm and 70mm lengths\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\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 Extension Tube for Solar Discover CaK Assembly - 50mm\u003c\/h2\u003e\n      \u003cp\u003eThe Antlia 50mm Extension Tube gives more back focus, if needed, when the Antlia Solar Discover 5Å CaK assembly is used with a \u003ca href=\"\/en-us\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e. This helps the solar imaging system reach focus during shooting.\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\u003eAchieve Solar Focus: 50mm Extension for CaK Imaging\u003c\/h3\u003e\n      \u003cp\u003eAdding a Barlow lens to the 5Å CaK assembly moves the point of focus further out. If the imaging train then needs more back focus to reach focus, the Antlia 50mm Extension Tube provides it.\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\u003e50mm vs. 70mm Extension: Choosing the Right Back Focus\u003c\/h3\u003e\n      \u003cp\u003eAntlia offers this extension tube in two lengths, 50mm and 70mm. The right one depends on how much extra back focus your setup needs to reach focus with the Barlow lens.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003e50mm Extension (This Model):\u003c\/strong\u003e The shorter of the two lengths.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003e70mm Extension:\u003c\/strong\u003e The longer version, for setups that need more back focus than the 50mm tube gives.\u003c\/li\u003e\n      \u003c\/ul\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\"\u003eWhen do I need the Antlia 50mm Extension Tube for my CaK assembly?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou need the Antlia 50mm Extension Tube when you add a \u003cstrong\u003eBarlow lens\u003c\/strong\u003e to your imaging train with the Antlia Solar Discover 5Å CaK assembly and find you cannot reach focus. This shows when the \u003ca href=\"\/en-us\/collections\/focusers\"\u003efocuser\u003c\/a\u003e is racked all the way out but the image remains soft. Antlia offers the tube to achieve more back focus if needed.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the Antlia 50mm Extension Tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe tube goes in the imaging train to add back focus when the 5Å CaK assembly is used with a Barlow lens. Antlia does not state the thread or the exact position in the train; contact us if you need help planning your setup.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eShould I get the 50mm or 70mm Antlia Extension Tube for my Solar Discover CaK Assembly?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAntlia offers both lengths to achieve more back focus if needed. Choose the \u003cstrong\u003e50mm tube\u003c\/strong\u003e if that is enough to reach focus with your Barlow lens, and the 70mm version if your setup needs more.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Antlia 50mm Extension Tube work with other telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAntlia offers this extension tube as an accessory for the \u003cstrong\u003eAntlia Solar Discover 5Å CaK assembly\u003c\/strong\u003e. It does not state the thread or compatibility with other telescopes.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main sign I need an extension tube for imaging the Sun with my Antlia CaK Assembly?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary sign is running out of focuser travel. If you have a Barlow lens in the optical path and have turned the focus knob as far \"out\" as it will go, but the image of the solar surface never becomes sharp, an extension tube like this 50mm model can give the extra back focus needed.\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\u003eLength\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePurpose\u003c\/td\u003e\n\u003ctd\u003eAdds back focus when using the Antlia Solar Discover 5Å CaK assembly with a Barlow lens\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAntlia Solar Discover 5Å CaK assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e50mm\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 Extension Tube (50mm)\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\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":51932625436957,"sku":"ANT-EXT-TUBE-50","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-src-Yo2t3HITDoBzjoBw_01358e1e-f049-4ca7-b129-cf8caa317a0c.jpg?v=1792550009","url":"https:\/\/davidastro.com\/en-us\/products\/antlia-extension-tube-for-solar-discover-cak-assembly-50mm","provider":"David Astro","version":"1.0","type":"link"}