{"product_id":"antlia-extension-tube-for-solar-discover-cak-assembly-70mm","title":"Antlia Extension Tube for Solar Discover CaK Assembly - 70mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e70mm extension tube for more back focus\u003c\/li\u003e\n\u003cli\u003eHelps reach focus when the 5Å CaK assembly is used with a Barlow lens\u003c\/li\u003e\n\u003cli\u003eOffered for the Antlia Solar Discover 5Å CaK Assembly\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\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 Extension Tube for Solar Discover CaK Assembly - 70mm\u003c\/h2\u003e\n      \u003cp\u003eThe Antlia 70mm Extension Tube gives more back focus, if needed, when the Antlia Solar Discover 5Å CaK assembly is used with a Barlow lens. 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\u003eThe 70mm Solution for Barlow Lens Focus with the 5Å CaK Assembly\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 70mm 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\u003eChoosing Between the 70mm and 50mm Extension Tubes\u003c\/h3\u003e\n      \u003cp\u003eAntlia offers both 70mm and 50mm extension tubes for the 5Å CaK assembly. The right one depends on how much extra back focus your setup needs to reach focus with the Barlow lens; the 70mm tube is the longer of the two.\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\"\u003eWhat is the purpose of the Antlia 70mm Extension Tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Antlia 70mm Extension Tube provides additional back focus, allowing you to reach a sharp image when using the Antlia Solar Discover 5Å CaK assembly in combination with a Barlow lens. A Barlow pushes the focal point outwards, and this tube extends the imaging train to meet it.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen would I need the Antlia 70mm tube for my Solar Discover CaK assembly?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou will need this 70mm extension tube if you add a Barlow lens to your CaK imaging setup and find you cannot achieve focus by moving your focuser all the way out. 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 know if I need the 70mm or the 50mm Antlia extension tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe choice depends on the specific optical path length of your Barlow lens and the travel range of your focuser. The \u003cstrong\u003e70mm tube\u003c\/strong\u003e is for setups requiring more back focus. If the 50mm tube does not give enough back focus to reach focus, choose the 70mm.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Antlia 70mm extension tube compatible with other solar filters?\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 solar filters or telescopes.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Antlia 70mm Extension Tube affect image quality?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt is an extension tube used to add back focus. Antlia does not describe any optical elements in it, and makes no claim about its effect on image quality.\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\u003eExtension Length\u003c\/td\u003e\n\u003ctd\u003e70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eMore back focus when using the 5Å CaK assembly with a Barlow lens, to reach focus\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDesigned For\u003c\/td\u003e\n\u003ctd\u003eAntlia Solar Discover 5Å CaK assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eModel Length\u003c\/td\u003e\n\u003ctd\u003e70mm\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 70mm Extension Tube for Solar Discover CaK Assembly\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\n  \u003cp\u003eContact us for warranty details.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":51932625469725,"sku":"ANT-EXT-TUBE-70","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-src-onLuB1wEw6Ac46Ac_e72c8bb4-11b8-44da-8338-d94e2cfabc10.jpg?v=1792550011","url":"https:\/\/davidastro.com\/fr-int\/products\/antlia-extension-tube-for-solar-discover-cak-assembly-70mm","provider":"David Astro","version":"1.0","type":"link"}