{"product_id":"starizona-m42-extension-15mm","title":"Starizona M42 Extension - 15mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds 15mm of spacing to an imaging train\u003c\/li\u003e\n\u003cli\u003eM42 male and female threads\u003c\/li\u003e\n\u003cli\u003eFixed-length for rigid connections\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 - 15mm\u003c\/h2\u003e\n\u003cp\u003eThe Starizona M42 Extension provides a fixed 15mm of spacing, designed for precisely tuning the back focus in your astrophotography imaging train. It features standard male and female M42 threads, allowing it to be inserted between M42-threaded components to achieve the exact distance required by your 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 Precise 15mm Back Focus with M42 Threads\u003c\/h3\u003e\n\u003cp\u003eCorrect back focus is critical for achieving sharp, flat fields with coma correctors, flatteners, and reducers. This Starizona extension offers a simple and rigid solution for adding exactly 15mm to your optical path, ensuring your camera sensor is positioned at the optimal focal plane.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed 15mm Length:\u003c\/strong\u003e Provides a precise, non-adjustable spacing solution that eliminates sources of tilt or flexure that can occur with variable-length adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM42 Thread Standard:\u003c\/strong\u003e Connects directly to a wide range of astronomy cameras, filter wheels, and accessories that use this common thread size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid Connection:\u003c\/strong\u003e By using a fixed-length tube, you ensure that your imaging components remain perfectly collinear, preserving optical alignment throughout an imaging session.\u003c\/li\u003e\n\u003c\/ul\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 M42 Extension - 15mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis 15mm extension is used to add a specific amount of distance within an astrophotography imaging train. Its purpose is to help you achieve the precise back focus distance required by optical correctors like field flatteners or focal reducers for optimal performance.\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 15mm Starizona M42 Extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou may need this extension if the distance between your corrector lens and your camera sensor is 15mm less than the required back focus. For example, if your flattener requires 55mm of back focus and your current setup only provides 40mm, this 15mm extension is designed to fill that exact gap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of threads does the Starizona M42 Extension have?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe extension features male M42 threads on one end and female M42 threads on the other. This allows it to be threaded directly in-line with other M42 accessories in your imaging train.\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\u003eM42 (male\/female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\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 M42 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":68045008142621,"sku":"STZ-EXTM42-15","price":6.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starizona-M42-Extension-1_705549bf-4120-449b-b599-56daef10ec94.jpg?v=1794410556","url":"https:\/\/davidastro.com\/en-us\/products\/starizona-m42-extension-15mm","provider":"David Astro","version":"1.0","type":"link"}