{"product_id":"explore-scientific-50mm-2-inch-t2-camera-adapter","title":"Explore Scientific 50mm 2-inch Camera Adapter with T2 Thread for DSLR Prime Focus Imaging","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Explore Scientific 50mm (2-inch) T2 Camera Adapter is the piece that bridges a 2-inch focuser and a camera-specific T-ring. The telescope side is a 2-inch fitting that goes into any 2-inch or larger focuser or star diagonal. The camera side carries a male T2 thread, which is the M42 x 0.75 standard that Canon, Nikon, Sony, Pentax and every other mainstream T-ring is cut to accept. Explore Scientific publishes an outside diameter of 76 mm, a height of 36 mm, and a weight of 0.15 lb (0.08 kg), and describes it as suiting any telescope with a 2-inch or larger focuser. Vendor item number 510365.\u003c\/p\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis is for the imager who wants the telescope to be the lens. In prime focus astrophotography you take the camera lens off entirely and let the objective project directly onto the sensor, and to do that you need an unbroken mechanical chain from the drawtube to the camera body. Your T-ring handles the camera end and terminates in a female T2 thread. Something has to present a male T2 thread at the telescope end, and that is exactly what this adapter is for. Without it you are left holding a T-ring with nothing to screw it onto.\u003c\/p\u003e\u003cp\u003eIt also earns its place if you move one camera between several scopes. Because the telescope side is a plain 2-inch fitting and the camera side is the universal T2 standard, one adapter serves every 2-inch focuser you own, and changing camera systems means buying a new T-ring rather than a new adapter. For visual observers who occasionally shoot the Moon or a bright planet with a DSLR, it is the cheapest way to make that possible without rebuilding the imaging train.\u003c\/p\u003e\u003ch2\u003eKey Features \u0026amp; Design\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMale T2 thread (M42 x 0.75) on the camera side, matching the T-mount standard used by mainstream DSLR and mirrorless T-rings\u003c\/li\u003e\n\u003cli\u003e2-inch telescope side, so it works with any 2-inch or larger focuser or star diagonal\u003c\/li\u003e\n\u003cli\u003e76 mm published outside diameter and 36 mm published height, so you can budget its contribution to the optical path before you order\u003c\/li\u003e\n\u003cli\u003ePublished weight of 0.15 lb (0.08 kg), light enough that it changes nothing about focuser balance or drawtube sag\u003c\/li\u003e\n\u003cli\u003eCamera-agnostic by design: change bodies or brands and you only replace the T-ring, not this adapter\u003c\/li\u003e\n\u003cli\u003eThreaded camera interface rather than a compression ring, so once the T-ring is snug the camera cannot rotate or creep during a long exposure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMechanical Design\u003c\/h2\u003e\u003cp\u003eThe whole point of this part is thread standards, so it is worth being precise. T2, sometimes written T-mount, is a 42 mm diameter male thread with a 0.75 mm pitch — M42 x 0.75. It is not the same as the old M42 x 1.0 Pentax screw mount, and the two will cross-thread if you force them, so check the pitch rather than the diameter. The T2 standard also carries a spacing convention: a T-ring is machined so that the sensor sits roughly 55 mm behind the shoulder of the male T2 thread. That figure exists because camera flange distances differ — a Canon EOS body registers at about 44 mm and a Nikon F body at about 46.5 mm — and the T-ring makes up the remainder so that every system arrives at the same 55 mm. It matters here because the adapter's 36 mm height is 36 mm of focuser in-travel you have to give back. A refractor with a generous drawtube will not notice; a Newtonian with the focuser board set for eyepieces may not reach focus at all without moving the primary or adding a low-profile focuser. Work out your available in-travel before you order rather than after.\u003c\/p\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrime focus DSLR or mirrorless imaging of the Moon, the Sun with proper full-aperture filtration, and bright planets\u003c\/li\u003e\n\u003cli\u003eDeep-sky imaging with a crop-sensor body where the M42 clear aperture is not a limitation\u003c\/li\u003e\n\u003cli\u003eAttaching a camera to a 2-inch focuser on a scope that has no dedicated rear thread of its own\u003c\/li\u003e\n\u003cli\u003eSharing one camera across several telescopes without buying an adapter for each\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eYou need a T-ring for your specific camera mount, and it must be a T2 ring — female M42 x 0.75. This is the point where imagers most often order the wrong part, so read carefully: Explore Scientific's own Canon EOS and Nikon camera rings in this range are M48 x 0.75, not M42, and they will not thread directly onto this adapter. Those larger rings belong on an M48 imaging train. Explore Scientific's M48 to M42 reduction adapter is the part that normally bridges the two standards, but Explore Scientific does not publish which end of that ring is male and which is female, and a ring sold as an M48-to-M42 reduction and one sold as an M42-to-M48 step-up can be the same object described from opposite ends. Rather than guess, tell us what is on each of your two fittings and we will confirm the bridging part before you order. If your camera ring already says T2, T-mount or M42 x 0.75, none of that applies and this adapter is the correct partner on its own. On the telescope side, any 2-inch focuser or 2-inch star diagonal will accept it, though putting a camera behind a diagonal adds glass and a right-angle bend that most imagers avoid. Fit is genuinely model-dependent once you factor in drawtube depth and available in-travel, so tell our team in Bolton what scope and camera you are pairing and we will confirm the combination before you buy.\u003c\/p\u003e\u003ch2\u003eGood to Know Before You Order\u003c\/h2\u003e\u003cp\u003eThe T-ring is not included and neither is the camera; this adapter is only the middle link. The more important caveat is aperture. An M42 throat gives you somewhere around 38 to 39 mm of clear aperture once the threads are cut, and a full-frame sensor has a 43.3 mm diagonal, so a full-frame body behind any T2 adapter will show darkened corners on a well-illuminated field. That is a property of the T2 standard rather than a fault in this part, and it is precisely why the M48 x 0.75 standard exists. With an APS-C or Micro Four Thirds sensor it is a non-issue. Explore Scientific does not publish a filter thread for this adapter, so if you intend to thread a 2-inch filter into the telescope end, contact us and we will confirm before you order. Finally, remember that 36 mm of mechanical length has to fit inside your focuser's travel range.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eDoes this include the T-ring for my camera?\u003c\/strong\u003e No. This adapter provides the male T2 thread on the telescope side only. You buy the T-ring separately to match your camera mount, and it screws onto this.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs T2 the same as M42?\u003c\/strong\u003e Only partly. T2 is M42 x 0.75, a 42 mm thread with a fine 0.75 mm pitch. The older M42 x 1.0 Pentax screw mount is the same diameter with a coarser pitch and will not mate correctly. Always confirm the pitch.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill Explore Scientific's M48 Canon or Nikon camera rings screw onto this?\u003c\/strong\u003e Not directly. Those rings are M48 x 0.75 and this adapter presents M42 x 0.75, so a bridging ring between the two standards is required. Because the vendor does not publish thread genders, send us the details of both fittings and we will confirm which ring you need.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it vignette my full-frame camera?\u003c\/strong\u003e Very likely at the corners, because the M42 clear aperture is smaller than a full-frame sensor diagonal. Crop-sensor bodies are unaffected. If full-frame coverage matters to you, build the train around M48 components instead.\u003c\/p\u003e\u003ch2\u003eBottom Line\u003c\/h2\u003e\u003cp\u003eThis is a small, inexpensive, well-defined part that does one job properly: it puts a standard male T2 thread on the back of a 2-inch focuser so a T-ring and camera can go on. Match it with a T2 camera ring rather than an M48 one, allow for its 36 mm of length in your focus travel, and it will simply work. If you are unsure which standard your imaging train is built on, contact our team in Bolton and we will sort it out with you before you order.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":53958567755887,"sku":"510365","price":96.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_0a5b31c5-5daf-43bb-a93f-608492ce34d5.jpg?v=1785960535","url":"https:\/\/ontariotelescope.com\/products\/explore-scientific-50mm-2-inch-t2-camera-adapter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}