{"product_id":"player-one-m54m-m68f-17-5mm-extender","title":"Player One M54M-M68F 17.5mm Extender","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Player One M54M-M68F 17.5mm Extender is a machined spacer with an M54×0.75 male thread on one end and an M68 female thread on the other, adding 17.5 mm to the optical path. It is a purely mechanical part with no glass and no electronics, made from aluminum 6061-T6.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you are bridging an M54 section of an imaging train to an M68 interface — such as a large flattener or telescope rear thread — and need 17.5 mm of length to reach a target backfocus.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM54 male to M68 female:\u003c\/strong\u003e M54×0.75 male on one end, M68 female on the other.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17.5 mm spacing:\u003c\/strong\u003e adds a fixed 17.5 mm to the optical path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum 6061-T6 body:\u003c\/strong\u003e light, corrosion-resistant, and dimensionally stable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully mechanical:\u003c\/strong\u003e no optical elements and no electrical connection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eUse it to step an M54 imaging train up to an M68 interface while adding 17.5 mm of spacing, for example between a camera-side M54 train and an M68 flattener or telescope adapter.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility \u0026amp; Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe extender presents an M54×0.75 male thread on one side and an M68 female thread on the other. Because it is a fixed-length spacer, include its 17.5 mm in your total backfocus calculation. If you want to confirm the M68 thread matches your flattener or telescope, send us the model and we will check it with you.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical spacer only:\u003c\/strong\u003e it carries no optical elements and passes no electronic signal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed 17.5 mm length:\u003c\/strong\u003e the spacing it adds is set and not adjustable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread conversion:\u003c\/strong\u003e it converts M54 male to M68 female, so both mating parts need the matching threads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo — it threads into an M54 male and an M68 female interface by hand and needs no tools or adjustment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBridging an M54 imaging train to an M68 interface while adding a fixed 17.5 mm of spacing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it contain any optics?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It is a bare mechanical spacer with no lenses or coatings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow much backfocus does it add?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e17.5 mm, which you should include in your spacing total.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a machined aluminum M54 male to M68 female spacer that adds a fixed 17.5 mm to the optical path, for bridging M54 and M68 sections of an imaging train.\u003c\/p\u003e","brand":"Player One Astronomy","offers":[{"title":"Default Title","offer_id":53834293444719,"sku":"M54M-M68F-17.5","price":54.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/M68F-M54M-20mm-extender-2.jpg?v=1784239803","url":"https:\/\/ontariotelescope.com\/products\/player-one-m54m-m68f-17-5mm-extender","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}