{"product_id":"shelyak-pu0124","title":"Shelyak T-mount – 31.75mm nosepiece adapter ring","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M42x0.75mm T-mount accessories to 1.25\" focusers\u003c\/li\u003e\n\u003cli\u003eEnables secure threaded attachment for cameras and spectroscopes\u003c\/li\u003e\n\u003cli\u003eStandard 31.75mm (1.25\") barrel diameter\u003c\/li\u003e\n\u003cli\u003eLow-profile design minimizes back focus consumption\u003c\/li\u003e\n\u003cli\u003eBlack anodized aluminum construction\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\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\u003eT-mount – 31.75mm nosepiece adapter ring\u003c\/h2\u003e\n\u003cp\u003eThis adapter bridges the critical gap between accessories using standard M42x0.75mm T-threads and any telescope equipped with a 1.25\" (31.75mm) focuser or eyepiece holder. It provides a secure, threaded connection essential for astrophotography and spectroscopy, replacing the simple slip-fit of a standard 1.25\" barrel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eConnect M42 T-Threads to Any 1.25\" Focuser\u003c\/h3\u003e\n\u003cp\u003eThe M42x0.75mm thread, commonly known as the T-mount or T-thread, is a universal standard for cameras, filter wheels, and scientific instruments. This adapter allows you to attach any such device to the most common telescope format—the 1.25\" barrel—ensuring a rigid, non-flexing connection that is critical for sharp imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEssential for Lightweight Spectroscopes and DSLR Imaging\u003c\/h3\u003e\n\u003cp\u003eThis adapter is the key component for mounting lightweight instruments that require a T-thread interface. It is used to attach a DSLR camera body (via its own T-ring) to a 1.25\" focuser for prime-focus imaging or to mount a spectroscope like the Shelyak Alpy 600 or Star'Ex for scientific analysis. It's also the required piece for using a Star Analyser 100 grating with a digital camera body. Please note: this adapter is intended for lighter accessories; heavier imaging trains should use a larger 2\" connection to prevent focuser strain. This component is included as a standard part with the Alpy 600 spectroscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the T-mount – 31.75mm nosepiece adapter for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter allows you to connect any accessory that has a female \u003cstrong\u003eM42x0.75mm T-thread\u003c\/strong\u003e to a standard \u003cstrong\u003e1.25\" (31.75mm) telescope focuser\u003c\/strong\u003e. It converts the threaded T-mount into a simple barrel that can be inserted and secured just like an eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this T-mount adapter to attach my DSLR to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. You will need two components: a T-ring specific to your camera brand (e.g., Canon, Nikon, Sony) and this T-mount to 1.25\" adapter. The T-ring attaches to your camera body, and this adapter threads into the T-ring, allowing the entire assembly to slide into your telescope's 1.25\" focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this T-mount adapter compatible with the Shelyak Alpy 600 spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is fully compatible. In fact, this exact adapter is included with the Shelyak Alpy 600 spectroscope as the standard method for attaching the instrument to a telescope's 1.25\" focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a Star Analyser 100 to my DSLR using this adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo use a Star Analyser 100 grating with a DSLR for stellar spectroscopy, you first attach a T-ring to your camera. Then, you thread this T-mount to 1.25\" adapter into the T-ring. Finally, you thread the Star Analyser 100 into the filter threads on the base of this adapter's 1.25\" barrel before inserting the whole assembly into the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter cause vignetting with my APS-C camera on an f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, no. The 1.25\" barrel format can cause some corner illumination drop-off (vignetting) on larger APS-C sensors, especially in faster optical systems. However, in a slow f\/10 system like a Schmidt-Cassegrain Telescope (SCT), the light cone is narrow enough that vignetting is typically minimal and can be easily corrected with flat frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the threads on this T-mount adapter M42x0.75mm or M42x1mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe threads are \u003cstrong\u003eM42x0.75mm\u003c\/strong\u003e. This is the standard \"T-thread\" or \"T-mount\" used in astronomy and photography. It is not compatible with M42x1mm threads (often called Pentax screw mount) found on some older camera lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Type\u003c\/td\u003e\n\u003ctd\u003eT-Mount to 1.25\" Nosepiece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.75mm) Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Side\u003c\/td\u003e\n\u003ctd\u003eMale M42x0.75mm T-Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\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\"\u003eT-mount – 31.75mm nosepiece 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\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":52943041823005,"sku":"SHK-PU0124","price":53.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-T-mount-31-75mm-nosepiece-adapter-ring-1_d12ac345-a31a-44c6-8eeb-cbd0e32263b4.jpg?v=1789616178","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-pu0124","provider":"David Astro","version":"1.0","type":"link"}