{"product_id":"shelyak-es0038","title":"Shelyak Optical kit for Star'Ex HR spectrograph - complete set","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAchieve spectral resolutions from R=700 up to R=30,000\u003c\/li\u003e\n\u003cli\u003eCovers the visible spectrum with a 400 nm to 700 nm wavelength range\u003c\/li\u003e\n\u003cli\u003eDesigned as the optical core for a DIY 3D-printed spectrograph\u003c\/li\u003e\n\u003cli\u003eFeatures an internal focal reduction ratio of 125:80\u003c\/li\u003e\n\u003cli\u003eIncludes the latest GEN 2 slit for improved results\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 HR spectrograph - complete set\u003c\/h2\u003e\n\u003cp\u003eThis optical kit for the Star'Ex HR spectrograph provides the core components for a high-resolution, 3D-printed instrument capable of achieving a spectral resolution from R=700 to R=30,000. It operates across the visible spectrum from 400 nm to 700 nm and features an internal reduction ratio of 125:80, allowing you to capture detailed spectral profiles of stars, nebulae, and other bright celestial objects.\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 the R=30,000 Star'Ex HR Spectrograph\u003c\/h3\u003e\n\u003cp\u003eThis kit contains the essential optical elements to construct your own Star'Ex High Resolution (HR) spectrograph, a project designed by Christian Buil. It enables the detailed study of stellar spectra, revealing chemical compositions and radial velocities with a precision determined by your choice of slit width, reaching up to an impressive R=30,000.\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\u003eVariable Spectral Resolution from R=700 to R=30,000\u003c\/h3\u003e\n\u003cp\u003eThe Star'Ex HR's primary strength is its adaptability. By swapping slits, you can adjust the spectral resolution from R=700 for quick surveys of fainter objects to an extremely high R=30,000 for resolving fine details in the spectral lines of bright stars. The operational wavelength range of 400 nm to 700 nm ensures full coverage of the visible spectrum, from deep violet to red.\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\u003eA 125:80 Ratio Foundation for Your 3D-Printed Spectrograph\u003c\/h3\u003e\n\u003cp\u003eEngineered as the heart of a DIY project, this kit is fully compatible with the 3D printing files available on Christian Buil’s website and mechanical kits from Azur3dPrint. The internal 125:80 reduction ratio is a key design parameter for matching your telescope's focal ratio to your imaging camera. Please note this is an opticals-only kit; it does not include any 3D-printed parts, mechanical hardware, adapters, or cameras.\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 Star'Ex HR Optical Kit used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis kit provides all the necessary optical components to build a Star'Ex High Resolution (HR) spectrograph. This instrument is used to analyze the light from celestial objects like stars and nebulae, splitting it into a spectrum to study their chemical composition, temperature, and motion.\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 the complete Star'Ex HR spectrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is an \u003cstrong\u003eopticals-only kit\u003c\/strong\u003e. To complete the project, you will need to source or fabricate the following items separately:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3D-Printed Body:\u003c\/strong\u003e Files are available from Christian Buil's website.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Parts:\u003c\/strong\u003e Screws and other hardware, potentially available in kits from vendors like Azur3dPrint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdapters:\u003c\/strong\u003e To connect the spectrograph to your specific telescope and camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging and Guiding Cameras:\u003c\/strong\u003e A main camera for capturing the spectrum and potentially a second for guiding.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Star'Ex HR achieve a resolution up to R=30,000?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe spectral resolution (R) is directly dependent on the width of the entrance slit. The Star'Ex HR design allows you to use different slits. A very narrow slit is used to achieve the highest resolution of \u003cstrong\u003eR=30,000\u003c\/strong\u003e, which allows for extremely fine detail in the spectrum, though it requires a brighter target and good seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat details can I see in the spectrum of a star like Vega (Alpha Lyrae) with the Star'Ex HR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the Star'Ex HR at high resolution, you can easily resolve the deep, broad absorption lines of the Balmer series (Hydrogen-alpha, beta, gamma) in Vega's spectrum. At the highest resolutions, you may also be able to detect much finer metallic lines and study the precise profile of the hydrogen lines to understand the star's atmospheric properties.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Star'Ex HR kit work with my 8\" f\/10 Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Star'Ex HR is well-suited for common telescopes like an 8\" f\/10 SCT. The spectrograph's internal \u003cstrong\u003e125:80 reduction ratio\u003c\/strong\u003e helps to optimize the focal ratio for the camera sensor, which is beneficial when starting with a longer f-ratio telescope. You will need to ensure you have the correct adapters to physically connect the spectrograph to your telescope's visual back.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 400 nm to 700 nm wavelength range of the Star'Ex HR cover?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis range covers the entire visible light spectrum that the human eye can see. It allows you to study many of the most important spectral features, including:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrogen-alpha (656 nm) and Hydrogen-beta (486 nm)\u003c\/strong\u003e lines in nebulae and stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSodium D lines (589 nm)\u003c\/strong\u003e, which are prominent in stars like our Sun.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium H \u0026amp; K lines (~393-397 nm)\u003c\/strong\u003e at the very edge of the violet range.\u003c\/li\u003e\n\u003c\/ul\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\u003eSpectral Resolution\u003c\/td\u003e\n\u003ctd\u003eR = 700 to R = 30,000 (depending on slit width)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e400 nm – 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Reduction Ratio\u003c\/td\u003e\n\u003ctd\u003e125 : 80\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\"\u003eComplete Optical Element Set for Star'Ex HR\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003eIncludes all mirrors, lenses, grating, and slit required for the project.\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":52943033925917,"sku":"SHK-ES0038","price":545.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Optical-kit-for-Star-Ex-HR-spectrograph-complete-set-1_47c1963a-bc6f-4343-8132-6ed7439acecf.jpg?v=1789616005","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-es0038","provider":"David Astro","version":"1.0","type":"link"}