{"product_id":"shelyak-es0039","title":"Shelyak Optical kit for Star'Ex LR spectroscope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBuild a complete Star'Ex Low Resolution spectroscope\u003c\/li\u003e\n\u003cli\u003eAchieves a typical resolution of R=650 at 650 nm\u003c\/li\u003e\n\u003cli\u003eDesigned for the visible spectrum from 400 nm to 700 nm\u003c\/li\u003e\n\u003cli\u003eFeatures an 80 mm focal length collimator and objective\u003c\/li\u003e\n\u003cli\u003e1:1 internal reduction ratio simplifies optical alignment\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\u003eOptical kit for Star'Ex LR spectroscope\u003c\/h2\u003e\n\u003cp\u003eThis optical kit provides the core components to build your own Star'Ex Low Resolution spectroscope, an instrument capable of a resolution of R=650 for analyzing faint deep-sky objects across the 400 nm to 700 nm visible spectrum. Based on a 1:1 internal ratio with an 80 mm focal length for both the collimator and objective, this kit is the starting point for a powerful DIY scientific instrument.\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\u003eBuild Your Own Spectroscope: An R=650 Faint Object Instrument\u003c\/h3\u003e\n\u003cp\u003eDesigned for the amateur astronomer ready for a rewarding project, this kit enables the construction of a spectroscope optimized for faint targets like nebulae, galaxies, and distant stars. With a resolving power of R=650, you can capture distinct spectral features, allowing for scientific analysis from a backyard observatory. The design is fully compatible with the 3D printing files developed by Christian Buil, creating a clear and proven path from components to a functional instrument.\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 400-700 nm Visible Spectrum Optical Path\u003c\/h3\u003e\n\u003cp\u003eThis kit is configured for spectroscopy in the visible range, from the violet edge at 400 nm to deep red at 700 nm. The included GEN 2 slit ensures precise light injection into the optical path. This wavelength range covers critical emission and absorption lines used to classify stars and analyze the composition of nebulae.\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\u003eAn 80mm Focal Length System: What You Need to Complete It\u003c\/h3\u003e\n\u003cp\u003eThe Star'Ex optical design uses an 80 mm focal length for both the collimator and objective, creating a simple and efficient 1:1 system. This optical kit contains only these core optical elements. To complete the spectroscope, you must source all other components separately.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3D-Printed Parts:\u003c\/strong\u003e The main body of the spectroscope must be 3D printed using the files available on Christian Buil’s website.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Hardware:\u003c\/strong\u003e Fasteners, adapters, and other mechanical components, such as those offered by Azur3dPrint, are required for assembly.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e You will need to provide your own science camera for capturing spectra and potentially a separate guide camera.\n\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 included in the Star'Ex LR optical kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis kit contains \u003cstrong\u003eonly the optical elements\u003c\/strong\u003e required to build a Star'Ex LR spectroscope. It does not include the 3D-printed housing, mechanical screws, camera adapters, or any cameras. You are purchasing the specialized lenses, gratings, and slit needed for the project.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of resolution can I expect with the Star'Ex LR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Star'Ex LR is designed to achieve a typical resolution of \u003cstrong\u003eR=650\u003c\/strong\u003e at 650 nm when using a 23-micron slit. This is considered low-to-medium resolution, ideal for capturing the spectra of faint objects where collecting maximum light is a priority.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat else do I need to build a complete Star'Ex LR spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo complete your spectroscope, you will need to provide the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe 3D-printed body and components, using files from Christian Buil's website.\u003c\/li\u003e\n\u003cli\u003eA mechanical kit with all necessary screws and hardware (e.g., from Azur3dPrint).\u003c\/li\u003e\n\u003cli\u003eA telescope adapter to connect the Star'Ex to your telescope.\u003c\/li\u003e\n\u003cli\u003eA science camera for recording the spectrum.\u003c\/li\u003e\n\u003cli\u003e(Optional) A guiding camera and module for long exposures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Star'Ex LR perform on a bright nebula like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Star'Ex LR is well-suited for targets like the Orion Nebula (M42). Its R=650 resolution is sufficient to clearly separate the main emission lines, such as Hydrogen-alpha, Hydrogen-beta, and the two Oxygen-III lines, allowing you to analyze the physical conditions within the nebula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Star'Ex LR to study the spectrum of a galaxy like Andromeda (M31) with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but it will be challenging. While the Star'Ex LR is designed for faint objects, a galaxy's light is spread out, making its surface brightness very low. You would need to target the bright core of M31 and use long exposures. The resulting spectrum will be continuous, showing the combined light of billions of stars, and you may be able to detect redshift with careful measurement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Star'Ex LR kit suitable for infrared (IR) spectroscopy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this specific kit is optimized for the visible spectrum (400 nm - 700 nm). Shelyak offers a separate, complementary optical kit to modify the Star'Ex LR for near-infrared (IR) observations from 650 nm to 1000 nm.\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\u003eResolution (@650 nm)\u003c\/td\u003e\n\u003ctd\u003eR = 650 typical with a 23-micron slit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e400 nm – 700 nm (Visible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Reduction Ratio\u003c\/td\u003e\n\u003ctd\u003e1:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollimator Focal Length\u003c\/td\u003e\n\u003ctd\u003e80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Focal Length\u003c\/td\u003e\n\u003ctd\u003e80 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\"\u003eStar'Ex LR Spectroscope Optical Element Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003eThis kit contains only the optical components. 3D-printed parts are not included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.shelyak.com\/software\/?lang=en\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\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":52943034155293,"sku":"SHK-ES0039","price":609.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Optical-kit-for-Star-Ex-LR-spectroscope-1_d1bfdc12-c43a-4de1-b63d-7ba51e81c514.jpg?v=1789616013","url":"https:\/\/davidastro.com\/fr-us\/products\/shelyak-es0039","provider":"David Astro","version":"1.0","type":"link"}