{"product_id":"starizona-m42-extension-5mm","title":"Starizona M42 Extension - 5mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds 5mm of Spacing to an Optical Train\u003c\/li\u003e\n\u003cli\u003eM42 Male and Female Threads\u003c\/li\u003e\n\u003cli\u003eRigid Mechanical Extension for 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\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 M42 Extension - 5mm\u003c\/h2\u003e\n\u003cp\u003eThe Starizona M42 Extension adds exactly 5mm of spacing to any optical train using standard M42 threads. This male-to-female threaded tube is a simple, rigid solution for precisely setting the back focus distance between your camera and field flattener or reducer, which is critical for achieving sharp stars across the entire image frame.\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 5mm of Precise Back Focus\u003c\/h3\u003e\n\u003cp\u003eEvery optical corrector, from field flatteners to coma correctors, requires a specific distance to the camera sensor for optimal performance. The Starizona 5mm extension is a fundamental building block for hitting that target. By inserting this spacer into the M42-threaded path, you add a fixed, non-flexing 5mm to your total back focus. This is often used in combination with other spacers to fine-tune the distance required by your specific imaging setup, ensuring your system is correctly configured for edge-to-edge sharpness.\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 purpose of the Starizona M42 5mm Extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt adds exactly \u003cstrong\u003e5mm of length\u003c\/strong\u003e to an M42-threaded imaging train. This helps you achieve the precise back focus distance required by your flattener, reducer, or coma corrector for optimal optical performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the Starizona 5mm extension in my imaging train for a refractor with a flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would thread the 5mm extension between your M42-threaded components, such as between the flattener and an off-axis guider or filter wheel, to add the necessary spacing. Its male and female M42 threads allow it to fit directly in the optical path without additional adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Starizona extension to help reach the 55mm back focus needed for my SCT corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 5mm M42 extension is a common component for building up to a standard 55mm back focus distance. You would typically combine it with other M42 spacers, T-adapters, and the camera's own flange distance to reach the exact total your specific corrector requires.\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 Type\u003c\/td\u003e\n\u003ctd\u003eM42 (Male\/Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension Length\u003c\/td\u003e\n\u003ctd\u003e5mm\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 M42 Extension - 5mm\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":68045007257885,"sku":"STZ-EXTM42-5","price":10.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starizona-M42-Extension-1_9154d8f6-1961-46fa-bea0-d28a0519ce39.jpg?v=1794410550","url":"https:\/\/davidastro.com\/products\/starizona-m42-extension-5mm","provider":"David Astro","version":"1.0","type":"link"}