{"product_id":"pegasus-astro-adapter-m66-female-to-m54-male-for-sw-esprit-100","title":"Pegasus Astro Adapter M66 Female to M54 Male (For SW Esprit 100)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Sky-Watcher Esprit 100 Flattener to M54 Accessories\u003c\/li\u003e\n\u003cli\u003eProvides a precise 15.8mm of backfocus spacing\u003c\/li\u003e\n\u003cli\u003eFemale Thread: M66 with 1.0mm pitch\u003c\/li\u003e\n\u003cli\u003eMale Thread: M54 with 0.75mm pitch\u003c\/li\u003e\n\u003cli\u003eEngineered for Pegasus Astro Indigo components\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\u003ePegasus Astro Adapter M66 Female to M54 Male (For SW Esprit 100)\u003c\/h2\u003e\n\u003cp\u003eThis Pegasus Astro adapter is the essential component for connecting your Sky-Watcher Esprit 100 flattener to the M54 standard, providing exactly 15.8mm of optical path length. It converts the Esprit's native M66 female thread (1.0mm pitch) to a male M54 thread with a standard 0.75mm pitch, allowing direct integration with modern filter wheels, off-axis guiders, and cameras.\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\u003eThe 15.8mm Bridge from Esprit 100 to M54 Accessories\u003c\/h3\u003e\n\u003cp\u003eThe Sky-Watcher Esprit 100 requires a specific backfocus distance for a flat field, and this adapter is machined to provide a precise 15.8mm contribution to that optical train. It solves the critical connection problem between the telescope's M66 flattener output and the widely adopted M54x0.75mm thread standard common on accessories like the Pegasus Astro Indigo series.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eFemale Thread (Telescope Side):\u003c\/strong\u003e M66 with a 1.0mm pitch, designed to securely attach to the Esprit 100's field flattener.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMale Thread (Camera Side):\u003c\/strong\u003e M54 with a 0.75mm pitch, providing a rigid connection point for your imaging equipment.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eFixed Spacing:\u003c\/strong\u003e The 15.8mm length is non-adjustable, ensuring repeatable and accurate spacing every time you assemble your imaging train.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eExample Imaging Train: Achieving 63mm Backfocus\u003c\/h3\u003e\n\u003cp\u003eThis adapter is a key part of building a fully-featured imaging train with the Esprit 100. When combined with other standard components, it allows you to achieve the correct total backfocus distance for sharp stars across the frame. For example, a complete setup can be assembled to hit a 63mm backfocus target.\u003c\/p\u003e\n\u003cp\u003eA confirmed, optimal imaging train consists of the Sky-Watcher Esprit 100, this 15.8mm M66-to-M54 adapter, a Pegasus Astro Indigo OAG, a Pegasus Astro Indigo Filter Wheel, and a QHY268M camera. This specific combination results in the required 63mm backfocus for the Esprit 100 system.\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 primary function of this Pegasus M66 to M54 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary function is to connect the M66 threaded field flattener of a Sky-Watcher Esprit 100 telescope to standard M54 threaded astrophotography accessories. It also provides a fixed optical path length of \u003cstrong\u003e15.8mm\u003c\/strong\u003e to help achieve the telescope's required backfocus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much backfocus does this Esprit 100 adapter add to the imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter adds exactly \u003cstrong\u003e15.8mm\u003c\/strong\u003e of backfocus distance. This value is critical for calculating the total spacing needed for your specific camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the threads on the Pegasus adapter standard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the male M54 thread uses the standard \u003cstrong\u003e0.75mm pitch\u003c\/strong\u003e common to most astronomy equipment. The female M66 thread uses a \u003cstrong\u003e1.0mm pitch\u003c\/strong\u003e specifically to match the output of the Sky-Watcher Esprit 100's flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter with a telescope other than the Sky-Watcher Esprit 100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is specifically designed for the Sky-Watcher Esprit 100. While it might physically thread onto another telescope with an M66x1.0mm output, its 15.8mm length is optimized for the Esprit's backfocus requirement and may not be correct for other optical systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I build a complete imaging train for my Esprit 100 using this Pegasus adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA proven combination for the Esprit 100 that achieves the optimal 63mm backfocus is: \u003cstrong\u003eEsprit 100 Flattener → this M66-to-M54 Adapter → Pegasus Indigo OAG → Pegasus Indigo Filter Wheel → QHY268M Camera\u003c\/strong\u003e. This setup provides a complete, rigid imaging solution.\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 ZWO camera on an Esprit 100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, as long as your ZWO camera and any accessories (like a filter wheel or OAG) can connect via the standard M54x0.75mm male thread on this adapter. You will need to calculate your total backfocus to ensure you meet the Esprit 100's requirement, using this adapter's 15.8mm contribution as a starting point.\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\u003eTelescope Side Thread\u003c\/td\u003e\n\u003ctd\u003eM66 Female (1.0mm Pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Side Thread\u003c\/td\u003e\n\u003ctd\u003eM54 Male (0.75mm Pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackfocus Contribution\u003c\/td\u003e\n\u003ctd\u003e15.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eConnects SW Esprit 100 Flattener with M54 accessories\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExample Imaging Train\u003c\/td\u003e\n\u003ctd\u003eSW Esprit 100 + Adapter + Indigo OAG + Indigo Filter Wheel + QHY268M = 63mm\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 M66 Female to M54 Male (For SW Esprit 100)\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\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/pegasus-astro-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003ePegasus Astro 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pegasus Astro","offers":[{"title":"Default Title","offer_id":52686356218141,"sku":"PEG-ADAPT-M66F-M54M","price":42.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/pegasus-astro-adapter-m66-female-to-m54-male-for-sw-esprit-100-1.png?v=1793649427","url":"https:\/\/davidastro.com\/fr-int\/products\/pegasus-astro-adapter-m66-female-to-m54-male-for-sw-esprit-100","provider":"David Astro","version":"1.0","type":"link"}