{"product_id":"svbony-m42x0-75-extension-tube-kit-5mm-10mm-15mm-20mm","title":"SVBONY M42x0.75 Extension Tube Kit (5mm, 10mm, 15mm, 20mm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIncludes four M42 extension tubes: 5mm, 10mm, 15mm, and 20mm\u003c\/li\u003e\n\u003cli\u003eStandard M42x0.75mm T2 male and female threads\u003c\/li\u003e\n\u003cli\u003eStackable to achieve combined lengths from 5mm to 50mm\u003c\/li\u003e\n\u003cli\u003eDurable all-metal, black anodized construction\u003c\/li\u003e\n\u003cli\u003eResolves back focus spacing for field flatteners and focal reducers\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\u003eSVBONY M42x0.75 Extension Tube Kit (5mm, 10mm, 15mm, 20mm)\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY M42x0.75 Extension Tube Kit solves critical back focus issues with four separate metal spacers—5mm, 10mm, 15mm, and 20mm—designed for flatteners and reducers. With standard M42x0.75mm male and female threads, these tubes can be combined in any order to achieve precise extension lengths from 5mm up to 50mm in 5mm increments.\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\u003eDial In Perfect Spacing: 5mm to 50mm of M42x0.75 Extension\u003c\/h3\u003e\n\u003cp\u003eField flatteners and focal reducers require a precise distance to the camera sensor to deliver sharp stars across the frame. This SVBONY kit gives you the tools to hit that target distance precisely. The set includes four separate tubes of 5mm, 10mm, 15mm, and 20mm lengths.\u003c\/p\u003e\n\u003cp\u003eBy stacking the tubes, you can create any spacing you need in 5mm steps, all the way up to a total of 50mm when all four are used together. This flexibility eliminates guesswork and allows you to build out your imaging train to the exact specification your optics require.\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\u003eAll-Metal Construction for a Zero-Flex Imaging Train\u003c\/h3\u003e\n\u003cp\u003eEach extension tube in the kit is machined from metal with a black anodized finish to ensure rigidity and minimize internal reflections. The precise M42x0.75mm threads (the common T2 standard) guarantee a secure, flex-free connection between your camera and accessories.\u003c\/p\u003e\n\u003cp\u003eUnlike variable or plastic spacers, these fixed-length metal tubes create a solid, stable optical train. This rigidity is critical for astrophotography, as it prevents sensor tilt and ensures that your optical alignment remains perfect throughout a long imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the SVBONY M42x0.75 Extension Tube Kit to get a specific distance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can combine the different tubes to achieve your desired length. For example, if you need 25mm of spacing, you would thread the \u003cstrong\u003e5mm\u003c\/strong\u003e and \u003cstrong\u003e20mm\u003c\/strong\u003e tubes together. The kit allows you to create any length in 5mm increments up to the 50mm maximum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the maximum extension I can achieve with the SVBONY M42 kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe maximum extension is \u003cstrong\u003e50mm\u003c\/strong\u003e, achieved by connecting all four tubes (5mm + 10mm + 15mm + 20mm) together.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill these SVBONY extension tubes work with my astronomy camera and accessories?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if your equipment uses the standard \u003cstrong\u003eM42x0.75mm T2 thread\u003c\/strong\u003e. This is the most common thread size for astronomy cameras, filter wheels, off-axis guiders, and many field flatteners and reducers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy flattener needs 18mm of back focus. Can I achieve this with the SVBONY M42 kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis kit can provide 15mm or 20mm of spacing, but not exactly 18mm. For such precise, non-5mm increments, you would typically use the 15mm tube from this kit and add a separate, smaller 3mm spacer or a fine-tuning variable ring to achieve the exact distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm connecting my telescope to a DSLR with an M42 T-ring. Can this SVBONY kit adjust the spacing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The M42 T-ring for your DSLR has female M42x0.75mm threads. You can place any combination of these extension tubes between your telescope's flattener\/reducer and the T-ring to set the correct distance to the DSLR's sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the threads on the SVBONY M42 extension tubes the same as T2 threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The designation \u003cstrong\u003eM42x0.75mm\u003c\/strong\u003e refers to a metric thread with a 42mm diameter and a 0.75mm thread pitch. This is the specification for the universal \"T2\" thread used in astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMale Thread\u003c\/td\u003e\n\u003ctd\u003eM42x0.75mm (T2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFemale Thread\u003c\/td\u003e\n\u003ctd\u003eM42x0.75mm (T2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Lengths\u003c\/td\u003e\n\u003ctd\u003e5mm, 10mm, 15mm, 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\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\"\u003e5mm M42x0.75 Extension Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e10mm M42x0.75 Extension Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e15mm M42x0.75 Extension Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e20mm M42x0.75 Extension Tube\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\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861258006813,"sku":"SV-F9160A","price":26.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-M42x0-75-Extension-Tube-Kit-Length-5mm-10mm-15mm-20mm-1_f3874c73-edde-4245-98c9-25118a0c370d.jpg?v=1788660644","url":"https:\/\/davidastro.com\/products\/svbony-m42x0-75-extension-tube-kit-5mm-10mm-15mm-20mm","provider":"David Astro","version":"1.0","type":"link"}