{"product_id":"shelyak-se0014","title":"Shelyak Adapter set for Lhires III (camera with backfocus 17 mm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects cameras with 17 mm backfocus to a Lhires III spectrograph\u003c\/li\u003e\n\u003cli\u003eEnsures precise sensor-to-spectrograph spacing\u003c\/li\u003e\n\u003cli\u003eCritical for achieving optimal spectral focus and resolution\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for the Shelyak Lhires III\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\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 set for Lhires III (camera with backfocus 17 mm)\u003c\/h2\u003e\n      \u003cp\u003eThis Shelyak adapter set is the essential component for coupling a camera with a specific 17 mm backfocus to the Lhires III spectrograph. Achieving this exact 17 mm spacing is not optional; it is the fundamental requirement for placing the camera sensor at the precise focal plane of the spectrograph's optical system, ensuring your spectra are sharply focused from one end to the other.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAchieving Critical 17 mm Spacing for the Lhires III\u003c\/h3\u003e\n      \u003cp\u003eIn high-resolution spectroscopy, focus is paramount. The Lhires III is designed with a specific focal plane, and this adapter set ensures your camera's sensor lands exactly on it. Using the correct adapter for your camera's 17 mm backfocus eliminates vignetting and image degradation, producing clean, scientifically valid data for stellar classification, radial velocity measurements, or emission line analysis.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is this Shelyak adapter set for the Lhires III used for?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter set is designed to physically connect a camera with a \u003cstrong\u003e17 mm backfocus\u003c\/strong\u003e to the Shelyak Lhires III spectrograph. Its primary purpose is to establish the precise, rigid spacing required for the camera's sensor to be at the spectrograph's focal plane.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 17 mm backfocus specification so important for the Lhires III?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eSpectrographs like the Lhires III have a fixed optical design with a very specific focal plane. If the camera sensor is too close or too far away, the resulting spectrum will be out of focus, blurred, and unusable for scientific analysis. This adapter guarantees the correct \u003cstrong\u003e17 mm distance\u003c\/strong\u003e is maintained.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter set for a camera with a different backfocus, like 13 mm, on my Lhires III?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This adapter set is machined specifically for cameras that have a native backfocus of \u003cstrong\u003e17 mm\u003c\/strong\u003e. Using it with a camera that has a different backfocus will result in an incorrect sensor position and poorly focused spectra. You must use the adapter set that matches your camera's backfocus.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich cameras are compatible with this Lhires III adapter set?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAny astronomical camera that has a native backfocus of \u003cstrong\u003e17 mm\u003c\/strong\u003e is compatible with this adapter set. It is crucial to check your camera's technical specifications to confirm its backfocus distance before purchasing an adapter.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIf I use this 17 mm adapter with my Lhires III on an 8\" SCT to observe Vega (Alpha Lyrae), what is the goal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe goal is to obtain a high-resolution spectrum of Vega, a type A0V star. This adapter ensures your camera is perfectly focused to capture the distinct hydrogen Balmer absorption lines (like H-alpha and H-beta) in Vega's atmosphere. Precise focus is critical for measuring the width and depth of these lines, which is a key part of stellar classification.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install this adapter set on my Lhires III spectrograph?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eInstallation typically involves threading the components of the adapter set onto the camera port of the Lhires III and then attaching your camera to the other side. For detailed instructions, you should refer to the main user manual for the Shelyak Lhires III spectrograph, as the adapter is a component of that system.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Lhires III Spectrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRequired Camera Backfocus\u003c\/td\u003e\n\u003ctd\u003e17 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\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 Set for Lhires III (17 mm Backfocus)\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003eComponents as required\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\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\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":52943044247837,"sku":"SHK-SE0014","price":124.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Adapter-set-for-Lhires-III-camera-with-backfocus-17-mm-1_4645ba94-e147-42ae-9cb3-95b72ff04884.jpg?v=1789616244","url":"https:\/\/davidastro.com\/fr-us\/products\/shelyak-se0014","provider":"David Astro","version":"1.0","type":"link"}