{"product_id":"starizona-m48-extension-15mm","title":"Starizona M48 Extension - 15mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds 15mm of spacing\u003c\/li\u003e\n\u003cli\u003eM48 Male and Female Threads\u003c\/li\u003e\n\u003cli\u003eFor achieving correct back focus\u003c\/li\u003e\n\u003cli\u003eRigid, solid construction\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 - 15mm\u003c\/h2\u003e\n\u003cp\u003eThe Starizona M48 Extension tube adds precisely 15mm of rigid spacing to an imaging train, providing the critical distance needed to achieve correct back focus with standard M48 threaded accessories. This component is essential for astrophotographers who need to fine-tune the distance between their camera sensor and a field flattener or reducer.\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 15mm of Precise Back Focus\u003c\/h3\u003e\n\u003cp\u003eBack focus is the exact, required distance from the rear element of a corrector lens to the camera's sensor plane. Without this precise spacing, stars at the edge of your image will appear distorted. The Starizona 15mm extension helps bridge the gap when your existing components don't quite add up to the manufacturer's specification.\u003c\/p\u003e\n\u003cp\u003eFeaturing male M48 threads on one side and female M48 threads on the other, this extension tube integrates seamlessly into any standard 2-inch imaging train. It provides a solid, secure connection that prevents flexure, ensuring your optical alignment remains perfect as you dial in the exact spacing your system requires.\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 is the primary use for the Starizona M48 15mm Extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary use is to add exactly \u003cstrong\u003e15mm\u003c\/strong\u003e of length to an astrophotography imaging train. This is done to achieve the precise back focus distance specified by a field flattener, reducer, or other corrector, ensuring sharp stars across the entire image field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy flattener needs 55mm of back focus and my camera setup provides 40mm. Is the Starizona 15mm Extension the right part?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the perfect component for that scenario. This extension is designed to add a fixed 15mm of spacing, which would take your current 40mm distance to the required 55mm total.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat threads does the Starizona 15mm Extension use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt uses standard \u003cstrong\u003eM48 threads\u003c\/strong\u003e. It has male threads on one end and female threads on the other, allowing it to be inserted between other M48-threaded accessories like filter wheels, off-axis guiders, and camera adapters.\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\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM48 (Male\/Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension Length\u003c\/td\u003e\n\u003ctd\u003e15mm\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 - 15mm\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":68045012435229,"sku":"STZ-EXTM48-15","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_64970e8b-3b75-4e2c-9f3b-d3a84934c3e8.jpg?v=1794410566","url":"https:\/\/davidastro.com\/en-us\/products\/starizona-m48-extension-15mm","provider":"David Astro","version":"1.0","type":"link"}