{"product_id":"qhyccd-combo-g1","title":"QHYCCD Adapter Kit Combo G1","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAchieves standard 55mm back focus for M48 correctors\u003c\/li\u003e\n\u003cli\u003eProvides 56mm back focus for Takahashi Epsilon M54 systems\u003c\/li\u003e\n\u003cli\u003eEnables correct 44.1mm spacing for Canon lenses\u003c\/li\u003e\n\u003cli\u003eSets precise 46.5mm back focus for Nikon lenses\u003c\/li\u003e\n\u003cli\u003eUtilizes a robust 6-screw connection system to prevent tilt\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\u003eQHYCCD Adapter Kit Combo G1\u003c\/h2\u003e\n\u003cp\u003eThe QHYCCD Adapter Kit Combo G1 is a standardized solution for achieving precise back focus, accommodating the 55mm standard for M48 correctors and the 56mm requirement for Takahashi Epsilon reflectors with M54 threads. This single kit also provides the exact spacing for Canon lenses at 44.1mm and Nikon lenses at 46.5mm, eliminating the complex calculations required when sourcing individual adapters.\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\u003ePrecise Spacing for 55mm and 56mm Optical Systems\u003c\/h3\u003e\n\u003cp\u003eHitting the exact back focus is critical for a flat field, and the two most common standards are 55mm and 56mm. The G1 Adapter Kit is engineered to meet both, providing the necessary components to achieve the 55mm distance required by most coma correctors and flatteners, as well as the 56mm needed for specialized systems like the Takahashi Epsilon series.\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\u003eCross-Compatible M48 and M54 Thread Support\u003c\/h3\u003e\n\u003cp\u003eModern imaging trains often use either M48 (2-inch filter) or M54 threads, especially with full-frame cameras and large correctors. The Adapter Kit Combo G1 includes the necessary components to interface with both M48 and M54 connections, ensuring broad compatibility with a wide range of telescopes, correctors, and off-axis guiders without needing to purchase separate adapter sets.\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 6-Screw System: A More Stable Imaging Train\u003c\/h3\u003e\n\u003cp\u003eInstead of relying on simple threads which can introduce sag or tilt, QHYCCD's adapter system uses a robust 6-screw connection. This method ensures all components are held rigidly and perfectly parallel to the sensor plane. This design prevents the subtle positional shifts that can occur as threaded connections are tightened, resulting in a more reliable and stable optical train from the camera to the telescope.\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\u003eNative Spacing for Canon (44.1mm) and Nikon (46.5mm) Lenses\u003c\/h3\u003e\n\u003cp\u003eFor wide-field astrophotography, high-quality DSLR camera lenses are an excellent choice. The G1 kit provides the precise spacing needed to use them with QHYCCD cameras, achieving the required 44.1mm back focus for Canon lenses and 46.5mm for Nikon lenses. This allows you to leverage your existing lens collection for imaging the Milky Way or large nebulae like the North American Nebula (NGC 7000).\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\u003eAdapter Kit G1 vs. DIY Solutions: Simplicity and Reliability\u003c\/h3\u003e\n\u003cp\u003ePreviously, assembling a correct imaging train required calculating the necessary back focus and purchasing individual spacers of various thicknesses—a process prone to error, especially for beginners. The G1 kit is a pre-engineered solution that removes this guesswork entirely.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIY\/Individual Spacers:\u003c\/strong\u003e Requires you to measure and calculate the light path of every component. A small miscalculation can lead to poor star shapes and wasted imaging time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQHYCCD Kit G1:\u003c\/strong\u003e Provides a tested, verified combination of parts designed to achieve common back focus standards like 55mm and 56mm directly. It is a faster, more reliable method for getting your imaging rig properly configured.\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 main purpose of the QHYCCD Adapter Kit Combo G1?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe QHYCCD Adapter Kit Combo G1 is a comprehensive solution designed to achieve precise back focus spacing for various common astrophotography setups. It simplifies the process of connecting a QHYCCD camera to different telescopes, correctors, and lenses by providing all the necessary components in one pre-configured package to hit standards like \u003cstrong\u003e55mm\u003c\/strong\u003e and \u003cstrong\u003e56mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat optical systems are supported by the QHYCCD G1 kit's 55mm and 56mm back focus options?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe kit is designed for broad compatibility. The \u003cstrong\u003e55mm\u003c\/strong\u003e back focus configuration is for typical multi-purpose coma correctors and flatteners using M48 threads. The \u003cstrong\u003e56mm\u003c\/strong\u003e configuration is specifically for systems like the Takahashi Epsilon reflector series, which often use M54 threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the QHYCCD G1 kit with my Takahashi Epsilon reflector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Adapter Kit Combo G1 is specifically designed to achieve the \u003cstrong\u003e56mm back focus\u003c\/strong\u003e required by the Takahashi Epsilon series, interfacing with its native M54 threads. This ensures your camera sensor is placed at the optimal distance for a flat, corrected field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a coma corrector with M48 threads requiring 55mm back focus. Is the QHYCCD G1 kit correct for this?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The QHYCCD G1 kit is designed to create the industry-standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e distance for correctors with M48 threads. This makes it a suitable choice for most popular coma correctors and field flatteners on the market.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does QHYCCD use a 6-screw system in the G1 kit instead of just threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 6-screw connection system provides a more rigid and stable connection than a simple threaded interface. Threads can have minor errors or loosen, potentially causing tilt in the imaging train. The \u003cstrong\u003e6-screw method\u003c\/strong\u003e locks components together, ensuring they remain perfectly parallel and eliminating a common source of elongated stars at the edge of the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the QHYCCD G1 kit support connecting my Canon DSLR lens to a QHY camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The kit provides the correct components to set the precise \u003cstrong\u003e44.1mm back focus\u003c\/strong\u003e required for Canon lenses. This allows you to use your high-quality Canon EF-mount lenses for wide-field astrophotography with your cooled QHYCCD camera.\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\u003eTarget System\u003c\/td\u003e\n\u003ctd\u003eRequired Back Focus \u0026amp; Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical Multi-Purpose Coma Corrector\u003c\/td\u003e\n\u003ctd\u003e55mm, M48 Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTakahashi Epsilon Reflector Series\u003c\/td\u003e\n\u003ctd\u003e56mm, M54 Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanon 35mm Lens\u003c\/td\u003e\n\u003ctd\u003e44.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNikon 35mm Lens\u003c\/td\u003e\n\u003ctd\u003e46.5mm\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/qhyccd-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eQHYCCD Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"QHYCCD","offers":[{"title":"Default Title","offer_id":52942981988637,"sku":"QHY-020135-G1","price":84.0,"currency_code":"CAD","in_stock":true}],"url":"https:\/\/davidastro.com\/products\/qhyccd-combo-g1","provider":"David Astro","version":"1.0","type":"link"}