{"product_id":"cs-m42-adapter","title":"CS-M42 adapter","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Player One Astronomy CS-M42 Adapter is a compact metal adapter that connects a CS-mount lens to an M42-threaded planetary camera. It carries CS female threads on one side and M42×0.75 male threads on the other, in a 6.5 mm-long body, so a CS lens can thread directly onto the camera's M42 front. Player One designed it for their planetary cameras, where you want to put a CS lens in front of the sensor.\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 own a planetary camera with an M42 front thread and want to mount a CS-mount lens to it — for example a wide-field, all-sky, or CCTV-style CS lens for meteor, sky-monitoring, or wide-field capture. It is a mechanical thread adapter, so it fits any imaging train where a CS-to-M42 transition is what you need.\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\u003eCS female to M42×0.75 male:\u003c\/strong\u003e the CS side accepts a CS-mount lens; the M42×0.75 male side threads onto a standard M42 camera front.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6.5 mm length:\u003c\/strong\u003e the adapter adds 6.5 mm of mechanical length between the lens and the camera body.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-metal construction:\u003c\/strong\u003e machined metal for repeatable threading and durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMounting a CS-mount lens on an M42-threaded Player One planetary camera.\u003c\/li\u003e\n\u003cli\u003eBuilding an all-sky or wide-field camera around a CS lens.\u003c\/li\u003e\n\u003cli\u003eAny imaging setup that needs a CS-to-M42 thread transition.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility \u0026amp; Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eOne side is CS female, which fits CS-mount lenses; the other is M42×0.75 male, the standard thread on the front of Player One planetary cameras. The 6.5 mm length is a fixed mechanical value — it does not set a focus or backfocus distance, since a CS lens reaches focus through its own focusing helicoid. A C-mount lens has a longer flange and needs an additional C-to-CS ring before it will thread on here. If you are unsure whether your lens and camera pair through this adapter, send us your lens mount and camera model and we will confirm the fit.\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 adapter only:\u003c\/strong\u003e it makes a thread connection and nothing else — no glass, no electronics, and no effect on the optical path beyond the 6.5 mm it adds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCS mount, not C mount directly:\u003c\/strong\u003e the lens side is CS. A C-mount lens threads on only with an added C-to-CS spacer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlayer One does not publish a weight:\u003c\/strong\u003e the adapter is a small machined part; if the exact figure matters for your kit, send us a note and we will weigh one from stock.\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 on by hand. The CS side accepts your lens and the M42×0.75 side screws onto the camera front, with no tools or adjustment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does it connect?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA CS-mount lens to an M42-threaded camera, such as a Player One planetary camera.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a C-mount lens with it?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly with an added C-to-CS adapter ring. On its own the lens side is CS; a C-mount lens has a longer flange and needs that extra ring to reach focus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it contain any glass or electronics?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It is a purely mechanical thread adapter — no optics and no electrical contacts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it set my backfocus?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. It adds a fixed 6.5 mm of length; a CS lens reaches focus through its own helicoid rather than a set spacing.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 6.5 mm all-metal CS-female to M42×0.75-male adapter that lets a CS-mount lens thread onto an M42 planetary camera — a simple mechanical connection with no glass or electronics.\u003c\/p\u003e","brand":"Player One Astronomy","offers":[{"title":"Default Title","offer_id":44014087045231,"sku":"CSM42","price":16.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/CS-M42-1-600x337__69074.jpg?v=1766570479","url":"https:\/\/ontariotelescope.com\/products\/cs-m42-adapter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}