{"product_id":"dcs-m48-0-75-extension-tube-17-5-mm","title":"DCS M48 × 0.75 Extension Tube – 17.5 mm","description":"\u003cdiv class=\"dcs-product-description\" style=\"color:#172436;line-height:1.7;\"\u003e\n\u003cdiv style=\"background:#102239;color:#ffffff;padding:26px;border-radius:12px;margin-bottom:22px;\"\u003e\n\u003cp style=\"margin:0 0 8px;letter-spacing:1.5px;font-size:12px;color:#b8d5ee;\"\u003eDARK CLEAR SKIES · IMAGING ACCESSORIES\u003c\/p\u003e\n\u003ch2 style=\"margin:0 0 12px;color:#ffffff;font-size:28px;line-height:1.25;\"\u003eAdd 17.5 mm.\u003cbr\u003eKeep your M48 connection.\u003c\/h2\u003e\n\u003cp style=\"margin:0;color:#ecf4fc;\"\u003eA fixed extension tube for an M48 × 0.75 imaging train, with a male thread at one end and a female thread at the other.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe \u003cstrong\u003eDCS M48 × 0.75 Extension Tube – 17.5 mm\u003c\/strong\u003e adds a specified \u003cstrong\u003e17.5 mm of spacing\u003c\/strong\u003e between compatible threaded components. Use it when your camera and accessories need additional separation to meet the back-focus requirement of your telescope’s corrector, reducer or flattener.\u003c\/p\u003e\n\u003cfigure style=\"margin:22px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/dcs-m48-17-5mm-extension-tube-studio-front.png?v=1794160005\" alt=\"Dark Clear Skies M48 extension tube showing the internal female thread and engraved branding\" width=\"1254\" height=\"1254\" style=\"display:block;width:100%;max-width:520px;height:auto;margin:auto;border-radius:10px;\"\u003e\u003cfigcaption style=\"text-align:center;font-size:13px;color:#516174;margin-top:8px;\"\u003eThe DCS-branded tube, shown from the female-threaded end.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cdiv style=\"background:#f0f6fb;border-left:4px solid #377fae;padding:18px 20px;margin:22px 0;\"\u003e\n\u003ch3 style=\"margin:0 0 10px;font-size:19px;\"\u003eThree details to match\u003c\/h3\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread size:\u003c\/strong\u003e M48 at both ends.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread pitch:\u003c\/strong\u003e 0.75 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdded spacing:\u003c\/strong\u003e 17.5 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2\u003eBuild the spacing your setup requires\u003c\/h2\u003e\n\u003cp\u003eCamera sensor distance, filter wheels, off-axis guiders and other adapters all contribute to the distance behind a corrector. This fixed-length tube provides a 17.5 mm section within that assembly, while retaining M48 × 0.75 connections.\u003c\/p\u003e\n\u003cp\u003eCheck the spacing specified for your exact optical accessory, then account for the components already installed. The 17.5 mm figure describes this tube’s specified back-focus contribution; it is not a complete back-focus requirement for every imaging system.\u003c\/p\u003e\n\u003ch2\u003eCheck your threads before ordering\u003c\/h2\u003e\n\u003cp\u003eThe tube’s \u003cstrong\u003emale M48 × 0.75 end\u003c\/strong\u003e screws into a matching female connection. Its \u003cstrong\u003efemale M48 × 0.75 end\u003c\/strong\u003e accepts a matching male connection. Both the diameter and pitch must match the equipment you are joining.\u003c\/p\u003e\n\u003cp\u003eM42\/T2 and M54 connections require suitable adapters. A matching nominal diameter alone does not establish compatibility with a different thread pitch. Check thread clearance and the remaining spacing in your own assembly before use.\u003c\/p\u003e\n\u003cfigure style=\"margin:22px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/dcs-m48-17-5mm-extension-tube-studio-male-thread.png?v=1794160057\" alt=\"DCS 17.5 mm M48 extension tube viewed from the external male-threaded end\" width=\"1254\" height=\"1254\" loading=\"lazy\" style=\"display:block;width:100%;max-width:520px;height:auto;margin:auto;border-radius:10px;\"\u003e\u003cfigcaption style=\"text-align:center;font-size:13px;color:#516174;margin-top:8px;\"\u003eThe external male thread at the opposite end of the tube.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;margin:14px 0 22px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#edf3f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:12px;border-bottom:1px solid #dce5ed;\"\u003eBrand\u003c\/th\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #dce5ed;\"\u003eDark Clear Skies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:12px;border-bottom:1px solid #dce5ed;\"\u003eProduct type\u003c\/th\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #dce5ed;\"\u003eFixed threaded extension tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#edf3f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:12px;border-bottom:1px solid #dce5ed;\"\u003eConnections\u003c\/th\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #dce5ed;\"\u003eM48 × 0.75 male to M48 × 0.75 female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:12px;border-bottom:1px solid #dce5ed;\"\u003eSpecified spacing\u003c\/th\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #dce5ed;\"\u003e17.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#edf3f8;\"\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:12px;border-bottom:1px solid #dce5ed;\"\u003eFinish\u003c\/th\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #dce5ed;\"\u003eBlack, with Dark Clear Skies branding\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\" style=\"text-align:left;padding:12px;border-bottom:1px solid #dce5ed;\"\u003eSKU\u003c\/th\u003e\n\u003ctd style=\"padding:12px;border-bottom:1px solid #dce5ed;\"\u003eDCS-M48-EXT-175\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat’s included\u003c\/h2\u003e\n\u003cp\u003eOne DCS M48 × 0.75 extension tube with 17.5 mm specified spacing. Other imaging equipment and any additional adapters are sold separately.\u003c\/p\u003e\n\u003ch2\u003eNeed another connection or length?\u003c\/h2\u003e\n\u003cp\u003eExplore our \u003ca href=\"\/collections\/telescope-adapters-extension-tubes\"\u003etelescope adapters and extension tubes\u003c\/a\u003e. If you need help choosing a spacer, tell us the exact components you are connecting and the back-focus distance you need to achieve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Dark Clear Skies","offers":[{"title":"Default Title","offer_id":55730421432696,"sku":"DCS-M48-EXT-175","price":14.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/dcs-m48-17-5mm-extension-tube-studio-front.png?v=1794160005","url":"https:\/\/www.darkclearskies.co.uk\/products\/dcs-m48-0-75-extension-tube-17-5-mm","provider":"Dark Clear Skies ","version":"1.0","type":"link"}