{"product_id":"pegasus-m68-male-to-m54-male-20mm","title":"Pegasus M68 Male to M54 Male Adapter - 20mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Pegasus Falcon 2 Rotator to M54 accessories\u003c\/li\u003e\n\u003cli\u003eAdds exactly 20mm of backfocus to the imaging train\u003c\/li\u003e\n\u003cli\u003eM68x1 Male thread on one side\u003c\/li\u003e\n\u003cli\u003eM54x0.75 Male thread on the opposite side\u003c\/li\u003e\n\u003cli\u003eFeatures internal M48 threads for 2\" filters\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\u003eDownloads\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\u003eM68 Male to M54 Male Adapter (20mm length)\u003c\/h2\u003e\n\u003cp\u003eThis Pegasus Astro adapter provides a secure, all-threaded connection from an M68 female port to an M54 female port, adding exactly 20mm of optical path length to your imaging train. It is specifically designed to bridge the gap between the Pegasus Falcon 2 Rotator and accessories like an Off-Axis Guider (OAG), ensuring a rigid connection and precise backfocus spacing.\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 M54 Connection: 20mm of Precise Spacing\u003c\/h3\u003e\n\u003cp\u003eAchieving the correct backfocus is critical for a flat field, and this 20mm adapter is machined to provide that exact distance. The male M68x1 threads attach directly to the Falcon 2 Rotator, while the male M54x0.75 threads connect to the telescope side of most modern OAGs or filter wheels. The design also prevents direct metal-on-metal collision between your primary accessories.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal M48 Threads:\u003c\/strong\u003e The adapter's inner bore is threaded for standard M48x0.75 (2-inch) filters, allowing you to place a filter in the optical path without needing a separate filter drawer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Anodized Finish:\u003c\/strong\u003e A matte black finish minimizes internal reflections, preserving image contrast by preventing stray light from reaching the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid Construction:\u003c\/strong\u003e Machined from a single piece of aluminum, the adapter eliminates flexure that can occur when stacking multiple smaller, thinner adapters to achieve the same spacing.\u003c\/li\u003e\n\u003c\/ul\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 primary use for this M68 to M54 20mm adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is specifically designed to connect the \u003cstrong\u003ePegasus Astro Falcon 2 Rotator\u003c\/strong\u003e (which has an M68 female output) to an accessory with an M54 female input, such as an Off-Axis Guider (OAG) or filter wheel. It adds a precise \u003cstrong\u003e20mm\u003c\/strong\u003e of spacing to help you achieve the required backfocus for your camera and reducer\/corrector combination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know if I need exactly 20mm of spacing for my setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need to calculate your backfocus budget. Start with the required backfocus of your flattener or reducer (e.g., 55mm). Then, subtract the backfocus of your camera, OAG, filter wheel, and any other adapters. If the remaining distance is 20mm, this adapter is the correct choice for your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I place a 2\" filter inside this 20mm adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The adapter features an internal M48x0.75 thread, which is the standard for 2-inch mounted astronomy filters. This allows you to install a light pollution or narrowband filter directly within the adapter itself, saving space in your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M68 to M54 adapter work with rotators other than the Falcon 2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt will work with any rotator or accessory that presents a female M68x1 thread and needs to connect to a device with a female M54x0.75 thread, provided that 20mm is the correct spacing required. However, it was engineered with the Falcon 2 Rotator and common OAGs in mind.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm connecting my Falcon 2 Rotator to a Celestron OAG. Is this the right part?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on the rest of your imaging train. The Celestron OAG for EdgeHD telescopes has an M54 female thread on the telescope side, making it mechanically compatible. You must confirm through your own backfocus calculation that the 20mm spacing this adapter provides is the exact distance you need to reach the 55mm (or other) backfocus requirement for your specific setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"prevents metal collision\" mean for this 20mm adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis means the adapter's length and shoulder design ensure that the body of your Falcon 2 Rotator will not make physical contact with the body of your OAG or filter wheel when fully threaded together. This prevents potential binding, scratching, or damage to your equipment.\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 Threaded Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Thread\u003c\/td\u003e\n\u003ctd\u003eM68 x 1 Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Thread\u003c\/td\u003e\n\u003ctd\u003eM54 x 0.75 Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Thickness (Backfocus)\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Filter Threads\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 (2\")\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\"\u003eM68 Male to M54 Male Adapter (20mm)\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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/pegasusastro.com\/download\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003eUnity Platform\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\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":49171395117341,"sku":"PEG-ADAPT-M68M-M54M-20","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/PEG-ADAPT-M68M-M54M-20.jpg?v=1726595543","url":"https:\/\/davidastro.com\/fr-us\/products\/pegasus-m68-male-to-m54-male-20mm","provider":"David Astro","version":"1.0","type":"link"}