{"product_id":"pegasus-astro-adapter-m68-male-to-m63-male-for-ricardi-m63-reducer-wo-reducers-with-m63-thread","title":"Pegasus Astro Adapter M68 Male to M63 Male (For Riccardi M63 Reducer \u0026 WO Reducers with M63 thread)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M68 female threads to M63 female threads\u003c\/li\u003e\n\u003cli\u003eAdds only 1.4 mm of backfocus to the optical train\u003c\/li\u003e\n\u003cli\u003eM68 Male Thread: 1.0mm pitch\u003c\/li\u003e\n\u003cli\u003eM63 Male Thread: 1.0mm pitch\u003c\/li\u003e\n\u003cli\u003eIdeal for Riccardi and William Optics M63 Reducers\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 M68 Male to M63 Male (For Riccardi M63 Reducer \u0026amp; WO Reducers with M63 thread)\u003c\/h2\u003e\n\u003cp\u003eThis precision-machined Adapter M68 Male to M63 Male provides a critical connection for imagers, linking a standard M68 female port to a female M63 thread while consuming only 1.4 mm of backfocus. The adapter features an M68x1.0mm male thread with a 4mm length and a male M63x1.0mm thread on the opposing side, ensuring a secure, rigid link between your focuser and popular field flatteners or reducers.\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\u003eM68 to M63 Conversion with a Minimal 1.4mm Optical Path\u003c\/h3\u003e\n\u003cp\u003eThe primary function of this adapter is to bridge the gap between accessories using the M63x1.0mm thread standard, most notably Riccardi and William Optics reducers, and focusers or extension tubes that terminate in an M68x1.0mm female thread. Its most critical design feature is the ultra-thin 1.4 mm profile. In complex imaging trains where every millimeter of backfocus is accounted for, this minimal thickness prevents you from running out of spacing for off-axis guiders, filter wheels, or rotators.\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\u003eSecure Threaded Connection for Imaging Reducers\u003c\/h3\u003e\n\u003cp\u003eUnlike compression fittings or slip-fit adapters, this component creates a direct, threaded connection between your optical tube and reducer. This rigidity is essential for maintaining perfect alignment and preventing tilt, which can compromise star shapes, especially with heavy cameras or in fast optical systems. The M68x1.0mm thread provides a robust interface to the telescope side, while the M63x1.0mm thread ensures a perfect match for compatible reducers and flatteners.\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 main purpose of this M68 to M63 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed to connect a field flattener or reducer with a female M63x1.0mm thread (like those from Riccardi or William Optics) to a focuser, rotator, or other accessory that has a female M68x1.0mm thread. It allows you to integrate these specific optical correctors into a larger-format imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 1.4 mm thickness of the adapter important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1.4 mm thickness\u003c\/strong\u003e is critical for preserving backfocus. Reducers and flatteners have a very specific required distance to the sensor plane. A thick adapter can consume too much of this distance, leaving no room for other essential accessories like filter wheels or off-axis guiders. This adapter's thin profile minimizes its impact on your optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know if my reducer is compatible with this M68 to M63 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need to verify that your reducer has a female M63 thread with a 1.0mm pitch. This is a common standard for many Riccardi and William Optics reducers, but it's essential to check your specific model's documentation to confirm the thread size and pitch before purchasing.\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 M63 reducer to a Sky-Watcher Esprit 100ED focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMany Sky-Watcher Esprit focusers terminate in a female M68x1.0mm thread, making this adapter a potential solution. However, you must confirm the thread specification of your specific focuser model and ensure that the total backfocus of your imaging train, including the 1.4 mm from this adapter, matches the requirement of your reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M68 to M63 adapter cause any vignetting with a full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe M63 clear aperture is generally sufficient for full-frame sensors when used with a compatible reducer designed for that format. The adapter itself has a clear internal diameter defined by the M63 thread and should not introduce additional vignetting beyond what the reducer itself produces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the thread pitch of 1.0mm standard for both the M68 and M63 sides?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This adapter uses a \u003cstrong\u003e1.0mm pitch\u003c\/strong\u003e for both the M68 and M63 male threads. This is a common standard in astronomy, but other pitches (like 0.75mm) exist for different threads, so always verify that both your focuser and reducer use the 1.0mm pitch standard.\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\u003eMale to Male Thread Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread 1\u003c\/td\u003e\n\u003ctd\u003eM68 Male (1.0mm Pitch, 4mm Length)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread 2\u003c\/td\u003e\n\u003ctd\u003eM63 Male (1.0mm Pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackfocus Consumption\u003c\/td\u003e\n\u003ctd\u003e1.4 mm\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 M68 Male to M63 Male\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":52686356316445,"sku":"PEG-ADAPT-M68M-M63M","price":39.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/pegasus-astro-adapter-m68-male-to-m63-male-for-ricardi-m63-reducer-wo-1.png?v=1793649427","url":"https:\/\/davidastro.com\/products\/pegasus-astro-adapter-m68-male-to-m63-male-for-ricardi-m63-reducer-wo-reducers-with-m63-thread","provider":"David Astro","version":"1.0","type":"link"}