{"product_id":"starizona-m48-extension-12mm","title":"Starizona M48 Extension - 12mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n  \u003cli\u003eAdds 12mm of spacing to an imaging train\u003c\/li\u003e\n  \u003cli\u003eM48 male and female threads for wide compatibility\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\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\u003eStarizona M48 Extension - 12mm\u003c\/h2\u003e\n          \u003cp\u003eThe Starizona M48 Extension is a simple, high-precision component designed to add exactly 12mm of length to your M48-threaded imaging train. This spacer is essential for achieving the specific back focus distance required by optical correctors like field flatteners and coma correctors, ensuring your stars are sharp across the entire field of view.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003eAchieving 12mm of Precise Back Focus\u003c\/h3\u003e\n          \u003cp\u003eEvery reducer, flattener, or corrector has a manufacturer-specified back focus—the exact distance from the corrector's flange to the camera sensor for optimal performance. This Starizona M48 extension provides a fixed 12mm of spacing, allowing you to bridge a gap in your imaging train and hit that critical distance. With male threads on one end and female threads on the other, it installs directly between other M48 components like filter wheels, off-axis guiders, or other spacers to dial in your configuration.\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\"\u003eWhat are the threads on the Starizona M48 Extension - 12mm?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThe extension features \u003cstrong\u003emale M48 threads\u003c\/strong\u003e on one side and \u003cstrong\u003efemale M48 threads\u003c\/strong\u003e on the opposite side, allowing it to be inserted anywhere in a standard M48 (2-inch filter thread) imaging train.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eHow much spacing does this Starizona M48 extension provide?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThis extension tube adds a precise optical path length of \u003cstrong\u003e12mm\u003c\/strong\u003e. It is designed for situations where you have calculated your current spacing and find you are exactly 12mm short of the required back focus for your corrector.\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 12mm Starizona M48 Extension?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eYou need this extension if the total back focus of your current imaging train (camera flange, filter wheel, off-axis guider, etc.) is 12mm less than the distance required by your field flattener or reducer. Always measure your existing components and subtract that total from the required back focus to determine the spacing 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\u003eThread\u003c\/td\u003e\n          \u003ctd\u003eM48 (male\/female)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eLength\u003c\/td\u003e\n          \u003ctd\u003e12mm\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\"\u003eStarizona M48 Extension - 12mm\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\u003ca href=\"https:\/\/davidastro.com\/pages\/starizona-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarizona Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":68045011976477,"sku":"STZ-EXTM48-12","price":4.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starizona-M48-Extension-1_7af0e19c-afe9-400e-880d-855df7f1dda9.jpg?v=1794410562","url":"https:\/\/davidastro.com\/en-us\/products\/starizona-m48-extension-12mm","provider":"David Astro","version":"1.0","type":"link"}