{"product_id":"shelyak-ba0034","title":"Shelyak C-mount to T-mount adapter ring","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects female C-mount threads (25.4mm) to male T-mount threads (M42x0.75mm)\u003c\/li\u003e\n\u003cli\u003eEnables use of larger T-mount cameras on C-mount guide ports or accessories\u003c\/li\u003e\n\u003cli\u003eAll-metal construction for secure, flex-free connections\u003c\/li\u003e\n\u003cli\u003eLow profile design minimizes added back focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eC-mount to T-mount adapter ring\u003c\/h2\u003e\n      \u003cp\u003eThis C-mount to T-mount adapter ring physically connects two essential standards in astronomical and industrial imaging. It features a male M42x0.75mm T-thread on one side and a female internal 25.4mm C-mount thread on the other, providing a simple, rigid solution for integrating hardware that would otherwise be incompatible.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eConnecting T-Mount Cameras to 25.4mm C-Mount Ports\u003c\/h3\u003e\n      \u003cp\u003eThe primary function of this adapter is to mount a camera with T-threads—such as a DSLR or a large-sensor astronomy camera—onto a device with a female C-mount port. This is a common requirement when using an off-axis guider's guide port, a microscope eyepiece port, or other specialized optical equipment that defaults to the smaller C-mount standard. This converter allows you to use your preferred, often larger, guide camera where only a C-mount was previously possible. Note that depending on your camera's sensor position, an additional C\/CS-mount spacer ring may be required to achieve the correct back focus.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary use for this C-mount to T-mount adapter ring?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts main purpose is to allow a camera or accessory with male \u003cstrong\u003eT-threads (M42x0.75mm)\u003c\/strong\u003e to be attached to a device with a female \u003cstrong\u003eC-mount thread (25.4mm)\u003c\/strong\u003e. This is most often used to connect a larger format guide camera to a smaller C-mount guide port on an off-axis guider or finderscope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the exact thread specifications for this adapter ring?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe adapter has two distinct threads:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMale Thread:\u003c\/strong\u003e M42x0.75mm, commonly known as T-mount or T2-mount.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFemale Thread:\u003c\/strong\u003e 25.4mm (1-inch) diameter with 32 threads per inch, which is the C-mount standard.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter to attach my DSLR camera to a microscope C-mount port?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is a valid application. If your DSLR has a standard T-ring attached (which provides male M42x0.75mm threads), this adapter will allow you to screw it directly onto a C-mount photo port on a microscope, assuming you can achieve focus.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need additional spacers for my guide camera to reach focus with this adapter ring?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003ePossibly. The C-mount standard has a flange-to-sensor distance of 17.526mm, while the related CS-mount is 12.5mm. If your guide camera is CS-mount native, you will likely need a 5mm C\/CS spacer ring in the optical train to reach focus. This adapter does not change that fundamental spacing requirement.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs this adapter the same as a T-ring for a camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. A T-ring adapts a specific camera brand's lens mount (like Canon EF or Nikon F) to a male T-thread. This adapter takes an existing male T-thread and converts it to fit into a female C-mount port. You would typically use a T-ring on your camera first, and then attach this adapter to the T-ring.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this C-mount to T-mount adapter add significant length to the optical path?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this type of adapter is designed to be as thin as possible to minimize its impact on back focus. While it adds a few millimeters, it is generally considered a \"low profile\" adapter and should not prevent you from reaching focus in most setups that have sufficient travel.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMale Thread\u003c\/td\u003e\n\u003ctd\u003eM42x0.75mm (T-mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFemale Thread\u003c\/td\u003e\n\u003ctd\u003e25.4mm x 32 TPI (C-mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eAdapts T-mount (male) to C-mount (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eC-mount to T-mount adapter ring\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/shelyak-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eShelyak 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":52943027110173,"sku":"SHK-BA0034","price":57.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-C-mount-to-T-mount-adapter-ring-1_a212b217-1888-4862-8fe6-79bd63e0c2df.jpg?v=1789615810","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-ba0034","provider":"David Astro","version":"1.0","type":"link"}