{"product_id":"shelyak-se0080","title":"Shelyak Adapter set for Lhires III (camera with 25mm backfocus)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCompatibility: Shelyak Lhires III Spectroscope\u003c\/li\u003e\n\u003cli\u003eRequired Camera Backfocus: 23.35mm to 27.35mm\u003c\/li\u003e\n\u003cli\u003eEnsures Precise Sensor-to-Optics Spacing\u003c\/li\u003e\n\u003cli\u003eCritical for High-Resolution Spectroscopy\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\u003eAdapter set for Lhires III (camera with 25mm backfocus)\u003c\/h2\u003e\n\u003cp\u003eThis adapter set for the Shelyak Lhires III spectroscope provides the precise mechanical connection for cameras that require a backfocus between 23.35mm and 27.35mm, ensuring the sensor is positioned correctly at the focal plane for high-resolution spectroscopy.\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 Lhires III: The 23.35mm to 27.35mm Backfocus Solution\u003c\/h3\u003e\n\u003cp\u003eIn spectroscopy, achieving perfect focus is paramount. This adapter set is engineered to solve the specific backfocus challenge for cameras in the 23.35mm to 27.35mm range, positioning the sensor precisely where the Lhires III forms its spectrum. This specificity is its strength, but also its limitation: it is not a universal adapter and will only work for cameras within this exact window.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCritical for Resolution:\u003c\/strong\u003e Without this exact spacing, spectral lines will appear blurred, compromising the resolution and scientific value of your data by destroying the sharpness of emission and absorption lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEliminates Guesswork:\u003c\/strong\u003e Provides a rigid, repeatable connection that removes a major variable from your optical train, allowing you to focus on data acquisition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for Lhires III:\u003c\/strong\u003e Mates seamlessly with the spectroscope's optical output, maintaining the alignment necessary for accurate results.\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 cameras are compatible with this Shelyak Lhires III adapter set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter set is designed for any camera, typically a CCD or CMOS model, that has a native backfocus distance between \u003cstrong\u003e23.35mm and 27.35mm\u003c\/strong\u003e. You must check your camera's technical specifications to confirm its backfocus before purchasing this adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a specific backfocus adapter like this needed for the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Shelyak Lhires III spectroscope has a fixed focal plane where the spectrum is formed. This adapter ensures the camera's sensor is placed exactly at that plane. Incorrect spacing results in a defocused spectrum, which blurs spectral lines and makes the data unusable for scientific analysis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Lhires III adapter if my camera's backfocus is outside the 23.35mm to 27.35mm range?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter set is not suitable for cameras outside the specified 23.35mm to 27.35mm backfocus range. Using it would prevent you from reaching proper focus. Shelyak offers different adapter sets for cameras with other backfocus requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm trying to capture the spectrum of Vega (Alpha Lyrae) with my Lhires III. Will this adapter work with a camera that has a 25mm backfocus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. A camera with a 25mm backfocus falls perfectly within the 23.35mm to 27.35mm range of this adapter set. It will provide the correct spacing to achieve a sharp, high-resolution spectrum of bright stars like Vega with your Lhires III.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I'm studying the H-alpha emission line of a nebula with the Lhires III, how does this adapter help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy ensuring your camera sensor is perfectly focused, this adapter allows the Lhires III to resolve fine details within the H-alpha emission profile. Precise focus is critical for detecting subtle Doppler shifts or structural changes in the emission line, which would be lost with incorrect spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this the only part I need to connect my camera to the Lhires III spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter set provides the correct backfocus spacing. However, you must also ensure that your camera's body has the appropriate mechanical threads to connect to the adapter itself. Please verify the thread type on both your camera and the Lhires III's output before assembly.\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\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Lhires III Spectroscope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Camera Backfocus\u003c\/td\u003e\n\u003ctd\u003e23.35mm to 27.35mm\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 set for Lhires III (25mm Backfocus)\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\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":52943044608285,"sku":"SHK-SE0080","price":171.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Adapter-set-for-Lhires-III-camera-with-25mm-backfocus-1_aa8a58b1-29c1-4b4d-86a5-0b8edcc97e35.jpg?v=1789616252","url":"https:\/\/davidastro.com\/products\/shelyak-se0080","provider":"David Astro","version":"1.0","type":"link"}