{"product_id":"svbony-sv119-m48x0-75-extension-tube-kit-5mm-10mm-15mm-30mm","title":"SVBONY SV119 M48x0.75 Extension Tube Kit (5mm, 10mm, 15mm, 30mm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFour-piece M48 extension tube kit\u003c\/li\u003e\n\u003cli\u003eIncludes 5mm, 10mm, 15mm, and 30mm lengths\u003c\/li\u003e\n\u003cli\u003eStandard M48x0.75 male and female threads\u003c\/li\u003e\n\u003cli\u003eStackable design for custom spacing\u003c\/li\u003e\n\u003cli\u003eInternally threaded to reduce reflections\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 SV119 M48 Extension Tube Kit (5mm, 10mm, 15mm, 30mm)\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV119 M48 Extension Tube kit provides the essential components for correcting spacing issues in any astrophotography train using M48x0.75 threads. This set includes four distinct tube lengths—5mm, 10mm, 15mm, and 30mm—allowing you to dial in the precise back focus required by field flatteners and focal reducers. By combining these tubes, you can achieve spacing from 5mm up to 60mm in 5mm increments, eliminating a critical source of image distortion.\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\u003eAchieve Precise Back Focus with 5mm, 10mm, 15mm, and 30mm Tubes\u003c\/h3\u003e\n\u003cp\u003eField flatteners and focal reducers require a specific distance to the camera sensor to function correctly, and this kit is the solution. With individual 5mm, 10mm, 15mm, and 30mm extensions, you have the building blocks to hit that target spacing exactly. For example, stacking the 5mm and 10mm tubes gives you 15mm, while combining all four provides 60mm of extension, covering the most common back focus requirements for popular optical correctors.\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\u003eM48*0.75 Anodized Aluminum with Anti-Reflection Threads\u003c\/h3\u003e\n\u003cp\u003eConstructed from black anodized aluminum, each tube in the SV119 kit is both lightweight and durable. The standard M48x0.75 threads ensure compatibility with 2-inch filter wheels, off-axis guiders, and camera adapters. To maintain maximum image contrast, the interior of each tube is threaded to trap stray light and prevent internal reflections from degrading your final image.\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\"\u003eWhat is the main purpose of the SVBONY SV119 M48 Extension Tube kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the SV119 kit is to achieve the precise \u003cstrong\u003eback focus\u003c\/strong\u003e (sensor-to-corrector distance) required by optical accessories like field flatteners, coma correctors, and focal reducers. The kit includes four lengths—\u003cstrong\u003e5mm, 10mm, 15mm, and 30mm\u003c\/strong\u003e—that can be stacked to create the exact spacing needed for sharp, aberration-free stars across your entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the SV119 kit to get 55mm of spacing for my field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMost flatteners require 55mm of back focus. To achieve this with the SV119 kit, you would stack the \u003cstrong\u003e30mm\u003c\/strong\u003e, \u003cstrong\u003e15mm\u003c\/strong\u003e, and \u003cstrong\u003e10mm\u003c\/strong\u003e tubes together (30 + 15 + 10 = 55mm). This allows you to precisely match the optical design requirements of your corrector using only the components in this kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the M48x0.75 threads on the SV119 kit compatible with standard 2\" filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003eM48x0.75\u003c\/strong\u003e thread is the standard for 2-inch astronomy filters. This means you can thread these extension tubes directly onto filter wheels, filter drawers, or camera nosepieces that accept 2\" filters, making them a versatile addition to almost any imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV119 extension tubes with my DSLR and a coma corrector on an f\/4 Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An f\/4 Newtonian requires a coma corrector, which in turn needs precise spacing (often 55mm) to work correctly. You would place the appropriate combination of SV119 tubes between your M48 T-ring on your DSLR and the coma corrector to achieve that distance, ensuring sharp stars from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the internal threading in the SV119 tubes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe internal threads act as light baffles. They are designed to trap off-axis light that might otherwise reflect off the inner surfaces of the tubes and reach the camera sensor. This reduces internal glare and significantly improves image contrast, resulting in a darker sky background and more vibrant detail in your astrophotos.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack all four SV119 tubes together?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can stack all four tubes (\u003cstrong\u003e5mm + 10mm + 15mm + 30mm\u003c\/strong\u003e) to achieve a total extension of 60mm. This modularity is the key feature of the kit, providing a wide range of spacing options from 5mm to 60mm in 5mm increments.\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eAstronomical Extension Tube Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMale Thread\u003c\/td\u003e\n\u003ctd\u003eM48*0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFemale Thread\u003c\/td\u003e\n\u003ctd\u003eM48*0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Lengths\u003c\/td\u003e\n\u003ctd\u003e5mm, 10mm, 15mm, 30mm\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 M48 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 M48 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 M48 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\"\u003e30mm M48 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\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":52861260955933,"sku":"SV-F9190A","price":20.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV119-M48-Extension-Tube-kit-of-5mm-10mm-15mm-30mm-1_0d99cc11-9e68-42ac-aba2-52bf6a006ba7.jpg?v=1788660672","url":"https:\/\/davidastro.com\/fr-us\/products\/svbony-sv119-m48x0-75-extension-tube-kit-5mm-10mm-15mm-30mm","provider":"David Astro","version":"1.0","type":"link"}