{"product_id":"pegasus-astro-adapter-m48-male-to-m42-female","title":"Pegasus Astro Adapter M48 male to M42 female","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48 (2-inch filter) accessories to M42 (T-thread) components\u003c\/li\u003e\n\u003cli\u003eAdds only 2mm of optical path length\u003c\/li\u003e\n\u003cli\u003eStandard 0.75mm thread pitch for universal compatibility\u003c\/li\u003e\n\u003cli\u003eMale M48x0.75 thread with 4mm length\u003c\/li\u003e\n\u003cli\u003eFemale M42x0.75 T-thread\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\u003eAdapter M48 male to M42 female\u003c\/h2\u003e\n\u003cp\u003eThis M48 Male to M42 Female Adapter solves a critical connection problem with a minimal optical profile of just 2mm. It features a standard 0.75mm thread pitch and a 4mm male thread length, ensuring a secure fit between larger M48 format correctors and smaller M42 T-thread accessories like cameras or filter wheels.\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\u003eBridge Your M48 Corrector to M42 Accessories with a 2mm Profile\u003c\/h3\u003e\n\u003cp\u003eThis adapter is the essential component for connecting an imaging train that uses mixed thread sizes. It allows you to attach M42 T-thread cameras, off-axis guiders, or filter wheels directly to a coma corrector or field flattener that terminates in a male M48x0.75 thread. By adding only 2mm to the total optical path, it helps you maintain the critical back focus distance required by your corrector, a major challenge when integrating multiple accessories.\u003c\/p\u003e\n\u003cp\u003eThe male M48 thread has a 4mm length, providing robust engagement with the female threads on your corrector for a rigid, no-tilt connection. The internal M42x0.75 female T-thread is the universal standard for most dedicated astronomy cameras, ensuring broad compatibility across your existing equipment.\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\"\u003eWhen do I need this M48 to M42 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need this adapter when your field flattener or coma corrector has male M48 threads (often called \"wide T-mount\"), but your next accessory in the imaging train, such as a filter wheel or the camera itself, has female M42 T-threads. This adapter steps down the thread size while consuming a minimal 2mm of back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter work with my 2-inch filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is not a filter cell. This adapter is designed to change the thread standard of your imaging train from M48 to M42. While M48 is the same thread as 2-inch filters, this adapter's purpose is mechanical connection, not filter placement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 2mm length of this M48 to M42 adapter important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMost correctors require a precise back focus distance (typically 55mm) from the corrector's flange to the camera sensor. Every adapter consumes some of this distance. At only 2mm thick, this adapter uses a very small amount of your available back focus, leaving more room for other critical components like off-axis guiders or filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter to connect my ZWO ASI camera to a Sky-Watcher Quattro coma corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is a perfect use case. The Sky-Watcher Quattro coma corrector typically outputs an M48 male thread. This adapter will convert that to the M42 female thread needed to connect ZWO's standard M42-threaded extension tubes or the camera body itself, helping you achieve the correct spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the M48 to M42 adapter strong enough to hold a heavy camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The adapter is machined from metal and designed to be a rigid part of the optical train. The 4mm male thread length ensures a secure, load-bearing connection that will not flex or tilt under the weight of a typical cooled astronomy camera and filter wheel.\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 full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eStepping down from a wider M48 opening to a smaller M42 T-thread can introduce vignetting on sensors larger than APS-C format, especially in fast optical systems. While the adapter itself is low profile, the M42 thread standard (with a ~41mm clear aperture) is the limiting factor and is generally not recommended for full-frame (36mm x 24mm) sensors.\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\u003eTotal Optical Length\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMale Thread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFemale Thread\u003c\/td\u003e\n\u003ctd\u003eM42x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMale Thread Length\u003c\/td\u003e\n\u003ctd\u003e4mm\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\"\u003eAdapter M48 male to M42 female\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\u003ca href=\"https:\/\/davidastro.com\/pages\/pegasus-astro-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003ePegasus Astro 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pegasus Astro","offers":[{"title":"Default Title","offer_id":52686355759389,"sku":"PEG-ADAPT-M48M-M42F","price":24.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/pegasus-astro-adapter-m48-male-to-m42-female-1.png?v=1793649427","url":"https:\/\/davidastro.com\/en-int\/products\/pegasus-astro-adapter-m48-male-to-m42-female","provider":"David Astro","version":"1.0","type":"link"}