{"product_id":"pegasus-m68-male-to-m68-male","title":"Pegasus M68 Male to M68 Male Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n  \u003cli\u003eAdds 1.4 mm of back focus\u003c\/li\u003e\n  \u003cli\u003eM68 x 1.0mm male threads on both sides\u003c\/li\u003e\n  \u003cli\u003e4 mm thread length for secure connection\u003c\/li\u003e\n  \u003cli\u003eInternal M54 x 0.75mm female 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\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\u003eAdapter M68 Male to M68 Male\u003c\/h2\u003e\n          \u003cp\u003eThis M68 Male to M68 Male adapter provides a precise 1.4 mm of optical path length, ideal for fine-tuning back focus in critical imaging setups. Each side features an M68 male thread with a 1.0mm pitch and 4 mm of length for a secure fit between components. The adapter also includes a versatile inner M54 x 0.75mm female thread, allowing you to step down to smaller accessories without needing a separate adapter.\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\u003ePrecision Spacing: A 1.4mm M68 Male-to-Male Adapter\u003c\/h3\u003e\n          \u003cp\u003eWhen your back focus calculation requires a small, precise adjustment, this adapter fills the gap. Its primary function is to join two female M68 threaded components, such as a focuser and a field flattener, while adding exactly 1.4 mm to the optical train. The M68 x 1.0mm threads are standard for many large-format correctors and focusers, making this a crucial part for achieving perfect star shapes to the edge of the frame.\u003c\/p\u003e\n          \u003cp\u003eThe adapter's utility is expanded by its internal M54 x 0.75mm female thread. This allows you to connect M54 accessories directly, offering a convenient step-down connection within your M68 imaging train. The thin but rigid design ensures no flexure, maintaining perfect optical alignment.\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 use for this M68 Male to M68 Male adapter?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThis adapter is designed to connect two components that both have female M68 x 1.0mm threads, such as connecting a focuser drawtube directly to a field flattener or rotator. Its main purpose is to add a very specific \u003cstrong\u003e1.4 mm\u003c\/strong\u003e of spacing to achieve the correct back focus distance required by your optical system.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the inner M54 thread on this M68 adapter?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThe inner M54 x 0.75mm female thread allows you to attach accessories with a male M54 thread directly to the adapter. This is useful for stepping down the connection size from M68 to M54 without needing an additional, thicker adapter, which helps conserve precious back focus.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eMy imaging train is 1.5mm short of the correct back focus. Will this 1.4mm M68 adapter work?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eA 0.1mm difference is generally within the tolerance for most amateur imaging setups, especially with slower optical systems (f\/7 or higher). While 1.5mm would be ideal, using this 1.4 mm adapter will likely produce excellent results and is far better than having a significant spacing error. For very fast systems (f\/4 or below), that 0.1mm may have a minor impact on corner star shapes.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the thread pitch of this M68 Male adapter?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eBoth the external M68 male threads and the internal M54 female thread have a standard pitch for astronomical equipment. The M68 threads have a \u003cstrong\u003e1.0mm pitch\u003c\/strong\u003e, and the internal M54 thread has a \u003cstrong\u003e0.75mm pitch\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this M68 adapter to connect my reducer to an off-axis guider?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eYes, if both your reducer and off-axis guider present female M68 x 1.0mm threads and you need exactly 1.4 mm of additional spacing between them, this adapter is the perfect solution. It provides a rigid, threaded connection that maintains alignment.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eIs this M68 adapter suitable for a heavy, large-format camera?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eAbsolutely. The 4 mm thread length on each side provides a secure, load-bearing connection that is more than adequate for large CCD or CMOS cameras. Threaded connections like this are significantly more rigid and resistant to tilt than compression or slip-fit adapters.\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 Thickness (Back Focus)\u003c\/td\u003e\n          \u003ctd\u003e1.4 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eExternal Thread\u003c\/td\u003e\n          \u003ctd\u003eM68 Male (Pitch 1.0mm)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eInternal Thread\u003c\/td\u003e\n          \u003ctd\u003eM54 Female (Pitch 0.75mm)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eThread Length\u003c\/td\u003e\n          \u003ctd\u003e4 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 M68 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\n    \u003cp\u003eNo downloads are available for this product.\u003c\/p\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects.\u003c\/p\u003e\n  \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pegasus Astro","offers":[{"title":"Default Title","offer_id":49171382108445,"sku":"PEG-ADAPT-M68M-M68M","price":27.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/PEG-ADAPT-M68M-M68M.jpg?v=1726595026","url":"https:\/\/davidastro.com\/fr-us\/products\/pegasus-m68-male-to-m68-male","provider":"David Astro","version":"1.0","type":"link"}