{"product_id":"shelyak-se0110","title":"Shelyak Acquisition Camera Ring Set: 13mm Backfocus","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e13mm Nominal Backfocus\u003c\/li\u003e\n\u003cli\u003eAccommodates Cameras with 9.15mm to 13.15mm Backfocus\u003c\/li\u003e\n\u003cli\u003eCompatible with Shelyak Lhires III Spectroscopes\u003c\/li\u003e\n\u003cli\u003eCompatible with Shelyak LISA Spectroscopes\u003c\/li\u003e\n\u003cli\u003eOfficial Standard-Issue Replacement Part\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\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\u003eAcquisition Camera Ring Set: 13mm Backfocus\u003c\/h2\u003e\n\u003cp\u003eThis acquisition camera ring set is the standard-issue adapter for Shelyak Lhires III and LISA spectroscopes, designed to position a camera sensor at the precise backfocus distance between 9.15mm and 13.15mm. It is the official factory component for mounting a guide or acquisition camera, ensuring the sensor sits exactly at the focal plane of the spectroscope's reflective slit.\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\u003eStandard-Issue Adapter for 9.15mm to 13.15mm Backfocus\u003c\/h3\u003e\n\u003cp\u003eAchieving the correct camera spacing is critical for accurate guiding during long spectroscopic exposures. This ring set is the original part supplied with new Lhires III and LISA instruments, built specifically to accommodate the common backfocus range of guide cameras from 9.15mm to 13.15mm. Whether you have misplaced the original adapter or need a spare, this component restores your instrument to its factory-specified configuration for reliable performance.\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 purpose of the Shelyak 13mm Acquisition Camera Ring Set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis ring set is an adapter designed to mount an acquisition or guide camera onto a Shelyak \u003cstrong\u003eLhires III\u003c\/strong\u003e or \u003cstrong\u003eLISA\u003c\/strong\u003e spectroscope. Its primary function is to set the camera sensor at the correct backfocus distance, which must be between \u003cstrong\u003e9.15mm and 13.15mm\u003c\/strong\u003e, for accurate guiding on the instrument's reflective slit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich spectroscopes is this 13mm ring set compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is specifically designed for and supplied as standard with the \u003cstrong\u003eShelyak Lhires III\u003c\/strong\u003e and \u003cstrong\u003eShelyak LISA\u003c\/strong\u003e series of spectroscopes. It is not intended for other models or brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy acquisition camera has a backfocus of 12.5mm. Will this adapter work with my Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This adapter is designed for any camera with a backfocus between 9.15mm and 13.15mm. Since 12.5mm falls within this range, this is the correct adapter for connecting your camera to a Lhires III or LISA spectroscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI lost the original camera adapter for my Lhires III spectroscope. Is this the correct replacement part?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the official, standard-issue adapter that is supplied with new Lhires III and LISA instruments. If your original part is missing or damaged, this is the correct factory replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 9.15mm to 13.15mm backfocus critical for a Lhires III or LISA spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis specific distance ensures that your guide camera's sensor is perfectly parfocal with the spectroscope's reflective entrance slit. If the spacing is incorrect, the star used for guiding will be out of focus, leading to poor tracking accuracy and trailed stellar spectra during your science exposure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this ring set to mount my main science camera to the spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is intended only for the \u003cstrong\u003eacquisition and guiding camera port\u003c\/strong\u003e. The main science camera attaches to a different port on the spectroscope, which typically requires a different adapter and backfocus calculation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Lhires_III_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eShelyak Lhires III Manual\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\/shelyak-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eShelyak 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":52943046017309,"sku":"SHK-SE0110","price":162.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Acquisition-camera-ring-set-13mm-backfocus-1_0b9a9a3e-0651-4da8-8dcc-db65033a0c0f.jpg?v=1789616285","url":"https:\/\/davidastro.com\/products\/shelyak-se0110","provider":"David Astro","version":"1.0","type":"link"}