{"product_id":"player-one-m54m-m54f-17-5mm-extender","title":"Player One M54M-M54F 17.5mm Extender","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Player One M54M-M54F 17.5mm Extender is a machined spacer with an M54×0.75 male thread on one end and an M54×0.75 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 building an M54 imaging train and need 17.5 mm of extra length to reach a target backfocus while keeping the M54 thread on both sides.\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 M54 female:\u003c\/strong\u003e M54×0.75 male on one end, M54×0.75 female on the other, so it stacks in line.\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 add 17.5 mm of spacing within an M54 imaging train — for example between a camera, filter wheel, or off-axis guider and the rest of the train — to hit a required backfocus.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility \u0026amp; Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe extender fits standard M54×0.75 threads. Because it is a fixed-length spacer, include its 17.5 mm in your total backfocus calculation. If you are not sure how much spacing your imaging train needs, send us your camera, filter, and corrector setup and we will work out the numbers 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\u003eM54 in, M54 out:\u003c\/strong\u003e it keeps the M54 thread standard on both sides rather than converting it.\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 directly into an M54 train 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\u003eAdding a fixed 17.5 mm of spacing to reach a target backfocus in an M54 imaging train.\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-female spacer that adds a fixed 17.5 mm to the optical path, for dialing in backfocus within an M54 imaging train.\u003c\/p\u003e","brand":"Player One Astronomy","offers":[{"title":"Default Title","offer_id":53834292527215,"sku":"M54M-M54F-17.5","price":49.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/M54F-M54M-17.5mm-extender-2.jpg?v=1784239741","url":"https:\/\/ontariotelescope.com\/products\/player-one-m54m-m54f-17-5mm-extender","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}