{"product_id":"player-one-m48f-m54m-17-5mm-adapter","title":"Player One M48F-M54M 17.5mm Adapter","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Player One M48F-M54M 17.5mm Adapter is a machined aluminium spacer that adds 17.5 mm of length while converting between thread standards. It carries M48 × 0.75 female threads on one end and M54 × 0.75 male threads on the other, so it both extends the train and steps M48 up to the larger M54 interface. It is used to reach a required backfocus while moving to an M54 thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if your train needs both an M48-to-M54 step and about 17.5 mm of added length — for example, taking an M48 camera side up to an M54 corrector or field-flattener output at the right backfocus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e17.5 mm spacing:\u003c\/strong\u003e adds a precise 17.5 mm of length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 female to M54 male:\u003c\/strong\u003e steps M48 × 0.75 up to M54 × 0.75 in the same part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium 6061-T6:\u003c\/strong\u003e machined aluminium body, light and rigid.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical only:\u003c\/strong\u003e no optical elements and no electronic connection.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfocus spacing:\u003c\/strong\u003e add 17.5 mm toward a camera, filter, or corrector backfocus figure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48-to-M54 step:\u003c\/strong\u003e convert an M48 interface up to M54 while adding length.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility \u0026amp; Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eOne end is M48 × 0.75 female; the other is M54 × 0.75 male. It both extends the train and converts M48 to M54. Backfocus is a sum of every part in the train; if you are working out how much spacing you need, send us your camera, filter, and corrector setup and we will work it out with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical adapter only:\u003c\/strong\u003e it adds length and steps the thread — there are no optics and no electronic communication through it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed length:\u003c\/strong\u003e the 17.5 mm step is not adjustable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread step:\u003c\/strong\u003e M48 × 0.75 female to M54 × 0.75 male.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads directly between an M48 female part and an M54 male part with no tools or adjustment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much length does it add?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e17.5 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it change the thread size?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It steps M48 × 0.75 female up to M54 × 0.75 male.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a machined aluminium 17.5 mm adapter that steps M48 up to M54, for setting backfocus while moving to the M54 interface.\u003c\/p\u003e","brand":"Player One Astronomy","offers":[{"title":"Default Title","offer_id":53834293543023,"sku":"M48F-M54M-17.5","price":40.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/M54M-M48F-17.5mm-Extender-s-600x598.png?v=1784239819","url":"https:\/\/ontariotelescope.com\/products\/player-one-m48f-m54m-17-5mm-adapter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}