{"title":"Shelyak Star Analyser Grating Filters","description":"\u003cp\u003eShelyak Star Analyser gratings are transmission diffraction gratings mounted in a standard 1.25\" filter cell. Placed in front of a camera, they spread each star's light into a spectrum next to its image, an easy first step into spectroscopy for classifying stars or spotting emission lines in novae and nebulae.\u003c\/p\u003e\u003cp\u003eThe Star Analyser 100 gives a compact spectrum and the Star Analyser 200 doubles the dispersion. Accessories include a spacer, a Star Analyser 200 mounting kit and a 3.8° prism.\u003c\/p\u003e","products":[{"product_id":"shelyak-star-analyser-100","title":"Shelyak Star Analyser 100","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTurns any astronomy camera or DSLR into a spectroscope\u003c\/li\u003e\n\u003cli\u003eInstalls as easily as a standard 1.25\" filter\u003c\/li\u003e\n\u003cli\u003eHigh-efficiency transmission grating blazed for the first order\u003c\/li\u003e\n\u003cli\u003eCaptures low-resolution spectra of every star in the field of view\u003c\/li\u003e\n\u003cli\u003eIdeal for an educational and low-cost entry into astronomical 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\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\u003eShelyak Star Analyser 100\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak Star Analyser 100 transforms your existing imaging setup into a capable spectroscope by threading directly into any standard 1.25″ filter wheel or nosepiece. This simple accessory requires no complex alignment, allowing you to capture low-resolution stellar spectra using the same 1.25″ workflow you already use for imaging.\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\u003eIntroduction to Spectroscopy: From Imaging to Spectral Analysis\u003c\/h3\u003e\n\u003cp\u003eThe Star Analyser 100 is designed to be the most accessible entry point into the world of astronomical spectroscopy. It operates just like a standard filter; simply place it in the optical path in front of your camera, and every star in the field will be accompanied by its spectrum. This allows you to immediately see and record the fundamental differences between stellar types without changing your established imaging process.\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\u003eOptical Design for Bright, Low-Resolution Spectra\u003c\/h3\u003e\n\u003cp\u003eThis accessory uses a high-efficiency transmission grating that is blazed for the first order, maximizing the amount of light directed into the spectrum. This results in brighter, more easily recorded spectra, which is critical for capturing data on fainter stars or with shorter exposures. The trade-off is resolution; this device is built for identifying broad spectral features and stellar classifications, not for detecting subtle radial velocity shifts.\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\u003eUniversal Compatibility: The 1.25\" Filter-Thread Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for maximum compatibility, the Star Analyser 100 is mounted in a standard 1.25″ filter cell. This allows it to be screwed into the nosepiece of a DSLR or dedicated astronomy camera, or placed in a 1.25\" filter wheel for easy switching between standard imaging and spectroscopy. No special adapters or changes to your optical train are required.\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\"\u003eHow do I use the Shelyak Star Analyser 100 with my DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUsing the Shelyak Star Analyser 100 with a DSLR is straightforward. You simply thread it onto the 1.25\" T-adapter nosepiece that connects your camera to the telescope's focuser. Once installed, every star in your camera's field of view will produce a visible spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of astronomical objects can I analyze with the Shelyak Star Analyser 100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Star Analyser 100 is ideal for observing bright, point-source objects. Its primary use is for capturing the spectra of stars to determine their spectral type (e.g., O, B, A, F, G, K, M). It can also be used to study the spectra of bright comets, novae, and quasars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Shelyak Star Analyser 100 work with my existing 1.25\" filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the Star Analyser 100 fits in a standard 1.25\" filter holder, it is a spectroscope, not a filter. It is designed to be used on its own to split starlight into a spectrum. Using it in combination with a narrowband or color filter would block most of the spectral data you are trying to capture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Shelyak Star Analyser 100 to see the difference between a hot blue star like Vega (Alpha Lyrae) and a cool red star like Betelgeuse (Alpha Orionis)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This is the perfect application for the Star Analyser 100. The spectrum of Vega will appear brightest in the blue-violet region, while the spectrum of Betelgeuse will be much brighter in the red and orange regions and show prominent absorption bands from molecules in its cool atmosphere. These differences will be immediately obvious in your images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I set up the Shelyak Star Analyser 100 on my 8\" Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor an 8\" SCT, you would attach your camera via a standard T-adapter and 1.25\" nosepiece. The Shelyak Star Analyser 100 simply threads into the front of the nosepiece before you insert it into the telescope's visual back or diagonal. No other equipment is needed to begin capturing stellar spectra.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'low-resolution' mean for spectra captured with the Shelyak Star Analyser 100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLow-resolution spectroscopy means you can see the broad features of a star's spectrum, like its overall color continuum and the strongest absorption lines (like the Balmer series in A-type stars). It is not designed to resolve very fine, narrow spectral lines or measure tiny doppler shifts used to find exoplanets. It excels at stellar classification and education.\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_Star_Analyser_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 Star Analyser Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\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":44968070807837,"sku":"SHK-PF0003","price":258.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/PF0003-Star-Analyser_5__12858.1671742177.1280.1280.png?v=1684348653"},{"product_id":"shelyak-star-analyser-200","title":"Shelyak Star Analyser 200","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInstantly converts your imaging camera into a spectroscope\u003c\/li\u003e\n\u003cli\u003eOptimized for use in filter wheels close to the sensor\u003c\/li\u003e\n\u003cli\u003eProduces a low-resolution spectrum for every star in the field\u003c\/li\u003e\n\u003cli\u003eThe ideal, low-cost entry into astronomical spectroscopy\u003c\/li\u003e\n\u003cli\u003eWorks with your existing DSLR or dedicated astronomy camera\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\u003eShelyak Star Analyser 200\u003c\/h2\u003e\n      \u003cp\u003eThe Shelyak Star Analyser 200 is the most direct path to exploring the science of starlight, converting your standard astrophotography setup into a capable spectroscope. This simple accessory threads into your filter wheel like any other filter, instantly generating a low-resolution spectrum for every star in your camera's field of view. It is engineered specifically for optical trains where the grating must be placed very close to the camera sensor, making it the definitive choice for integrated filter wheel systems.\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\u003eLow-Resolution Spectroscopy: Your First Step into Stellar Science\u003c\/h3\u003e\n      \u003cp\u003eThe Star Analyser 200 makes your first steps into spectroscopy as simple as taking a picture. By placing the grating in the light path, you can capture and compare the spectral signatures of different stars, revealing their chemical composition, temperature, and radial velocity. There's no complex alignment; you work under the same conditions as you would for standard imaging.\u003c\/p\u003e\n      \u003cp\u003eThis approach allows you to see the clear differences between a hot, blue star like Vega and a cool, red star like Betelgeuse. The trade-off is resolution; this is a survey instrument designed for accessibility, not for high-resolution scientific research. It excels at revealing the fundamental characteristics of stars without a steep learning curve.\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\u003eStar Analyser 200 vs. 100: Choosing for Your Imaging Train\u003c\/h3\u003e\n      \u003cp\u003eShelyak offers two primary gratings, the SA100 and the SA200, and the right choice depends entirely on your hardware. The Star Analyser 200 is specifically designed for setups where the distance between the grating and the camera sensor is short.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eStar Analyser 200 (This Model):\u003c\/strong\u003e Its higher dispersion is optimized for the close proximity found inside a filter wheel. Placing it further away would result in a spectrum that is too long to fit on the sensor.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eStar Analyser 100:\u003c\/strong\u003e This grating has lower dispersion and is intended for longer optical paths, such as when it is threaded onto the nosepiece of a camera. Using an SA100 inside a filter wheel would produce a spectrum that is too short and compressed.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003eIf you use a filter wheel for your imaging, the SA200 is the correct tool. For all other applications where the grating will be further from the sensor, the SA100 is the standard choice.\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\"\u003eHow do I use the Shelyak Star Analyser 200?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou use the Star Analyser 200 just like a standard filter. Simply thread it into an empty slot in your 1.25\" or 2\" filter wheel. When you rotate it into the light path, your camera will capture an image where each star is accompanied by its spectrum. No other changes to your imaging process are required.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat can I learn from a low-resolution spectrum of a star like Albireo (Beta Cygni)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eEven with the low resolution of the Star Analyser 200, you can clearly distinguish the spectral types of the two components of Albireo. You will see the spectrum of the golden K-type giant star (Albireo B) is rich in absorption lines in the orange\/red part of the spectrum, while the blue B-type main-sequence star (Albireo A) shows strong hydrogen lines in the blue\/green. This provides a direct, visual confirmation of their different stellar classifications.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Star Analyser 200 work with my 8\" SCT and a filter wheel?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, absolutely. An 8\" SCT with a filter wheel is an ideal setup for the Star Analyser 200. The instrument's aperture provides plenty of light for capturing spectra of even moderately faint stars, and the SA200's design is specifically optimized for the short distance between the filter wheel and the camera sensor.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Star Analyser 200 over the Star Analyser 100?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eChoose the \u003cstrong\u003eStar Analyser 200\u003c\/strong\u003e if you are mounting the grating in a \u003cstrong\u003efilter wheel\u003c\/strong\u003e. Its design is optimized for the very short distance between the filter and the sensor. Choose the \u003cstrong\u003eStar Analyser 100\u003c\/strong\u003e if you are mounting the grating further away, for example, by threading it onto the \u003cstrong\u003enosepiece of your camera\u003c\/strong\u003e.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need special software to process spectra from the Star Analyser 200?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile you can view the raw images with any FITS viewer, dedicated spectroscopy software is needed to calibrate the spectrum and extract scientific data. Popular free software options like \u003cstrong\u003eRSpec\u003c\/strong\u003e, \u003cstrong\u003eVSpec\u003c\/strong\u003e, or \u003cstrong\u003eBASS Project\u003c\/strong\u003e are designed to work with data from the Star Analyser and can help you process your images into meaningful graphs of intensity versus wavelength.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of objects can I observe with the Star Analyser 200?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Star Analyser 200 is best suited for point sources like stars. Excellent targets for beginners include:\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eStellar Classification:\u003c\/strong\u003e Compare the spectra of stars with different spectral types, like Vega (Type A), Capella (Type G), and Betelgeuse (Type M).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUnique Stars:\u003c\/strong\u003e Observe emission lines in Wolf-Rayet stars or the unique spectra of Carbon stars.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eQuasars:\u003c\/strong\u003e With a larger telescope, you can even capture the spectrum of a distant quasar like 3C 273 and identify its redshift.\u003c\/li\u003e\n    \u003c\/ul\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_Star_Analyser_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 Star Analyser Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\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\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":44968070971677,"sku":"SHK-PF0040","price":296.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/pf0040-sa200-f-t210x156_158__03510.1671742470.1280.1280.png?v=1684348655"},{"product_id":"shelyak-spacer-for-star-analyser","title":"Shelyak Spacer for Star Analyser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIncreases Grating-to-Sensor Distance\u003c\/li\u003e\n\u003cli\u003eAdjusts Spectrum Dispersion for Optimal Scale\u003c\/li\u003e\n\u003cli\u003eStackable Design for Custom Spacing\u003c\/li\u003e\n\u003cli\u003eMatches Spectrum Length to Sensor and Pixel Size\u003c\/li\u003e\n\u003cli\u003eMaintains the Star Analyser's Intrinsic Resolution\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\u003eShelyak Spacer for Star Analyser\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak Spacer for Star Analyser is a fundamental accessory for tuning the dispersion of your spectra. By physically increasing the distance between the Star Analyser diffraction grating and your camera's sensor, this spacer spreads the spectrum over more pixels, optimizing the image scale for your specific instrument setup.\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\u003eAdjusting Dispersion: Match Your Star Analyser to Your Sensor\u003c\/h3\u003e\n\u003cp\u003eIn the simple optical path of the Star Analyser, the spectral dispersion is directly proportional to the grating's distance from the sensor. This spacer provides a simple, mechanical way to increase that distance, physically lengthening the spectrum captured on your camera's chip. This is essential when using a camera with small pixels or a short focal length telescope, where the spectrum might otherwise be too compressed.\u003c\/p\u003e\n\u003cp\u003eIt is critical to understand that while this spacer increases dispersion, it does not increase resolution. The spectrograph's ability to resolve fine spectral details is an intrinsic property of the grating itself. This spacer simply spreads the existing detail over a larger area, it does not create new detail. For maximum flexibility, these spacers can be stacked to achieve even greater separation.\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 primary function of the Shelyak Spacer for Star Analyser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary function is to increase the physical distance between the Star Analyser's diffraction grating and your camera sensor. This action spreads the star's spectrum out over a larger area of the sensor, a property known as increasing the \u003cstrong\u003edispersion\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes adding the Shelyak Spacer improve the resolution of my spectra?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is very important to note that it does not. The spacer increases \u003cstrong\u003edispersion\u003c\/strong\u003e (the physical length of the spectrum on the sensor) but does not change the \u003cstrong\u003eresolution\u003c\/strong\u003e (the ability to distinguish fine details). Resolution is an intrinsic characteristic of the Star Analyser grating itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Shelyak Spacer help when imaging the spectrum of a star like Vega (Alpha Lyrae) with a large-format camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn a camera with a large sensor or with a short focal length instrument, a star's spectrum can appear very small and compressed. By using the Shelyak Spacer, you can increase the dispersion to spread the spectrum of Vega across more pixels, making its characteristic absorption lines easier to sample, see, and measure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Shelyak Spacer useful for a planetary camera with small pixels?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is particularly useful in this scenario. Cameras with small pixels require a more spread-out spectrum to avoid undersampling the spectral details. Using a spacer ensures that the resolved details from the grating are projected over enough pixels to be properly recorded by the camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use more than one Shelyak Spacer for my Star Analyser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the spacers are designed to be stackable. You can thread multiple spacers together to achieve a greater distance between the grating and sensor, which will further increase the dispersion of the resulting spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs there any downside to using the Shelyak Spacer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main trade-off is surface brightness. As you increase the dispersion, the light from the star is spread over more pixels. This reduces the brightness of the spectrum at any given point, which may require longer exposure times to achieve the same signal-to-noise ratio, especially for fainter targets.\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_Star_Analyser_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 Star Analyser 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":44968071037213,"sku":"SHK-BA0014","price":47.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/BA0014-Spacer-T201x150_13__54747.1671743305.1280.1280.png?v=1684348656"},{"product_id":"shelyak-el0166","title":"Shelyak Star Analyser 200 Mounting Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSecurely houses the Star Analyser 200 grating (sold separately)\u003c\/li\u003e\n\u003cli\u003eEnables easy integration into a standard 1.25\" or 2\" optical train\u003c\/li\u003e\n\u003cli\u003eEssential for using the SA-200 grating with filter wheels or camera nosepieces\u003c\/li\u003e\n\u003cli\u003eProvides a stable, correctly aligned mount for consistent results\u003c\/li\u003e\n\u003cli\u003eProtects the delicate diffraction grating from handling and debris\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\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\u003eStar Analyser 200 Mounting Kit\u003c\/h2\u003e\n\u003cp\u003eThis mounting kit provides the essential housing for the Star Analyser 200 diffraction grating. It is designed to securely hold the bare SA-200 grating, allowing you to integrate it seamlessly into your existing imaging train. By converting the standalone grating into a threaded cell, this kit enables its use in standard filter wheels, camera nosepieces, and other accessories, transforming it into a functional and protected spectroscopic tool.\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\u003eSecure Your Star Analyser 200 for Spectroscopic Imaging\u003c\/h3\u003e\n\u003cp\u003eIf you have purchased the Star Analyser 200 grating as a standalone component, this mounting kit is the critical next step for putting it to use. The kit provides a precisely machined housing that protects the delicate grating while ensuring it is held flat and perpendicular to the optical axis. This stability is crucial for acquiring clean, high-resolution stellar spectra without flexure or misalignment.\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 Star Analyser 200 mounting kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Star Analyser 200 is often sold as a bare diffraction grating. This mounting kit provides a protective housing for that grating, converting it into a standard threaded cell. This allows you to mount the spectroscope in a filter wheel, eyepiece barrel, or camera nosepiece just like a standard filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need this mounting kit for my Star Analyser 200?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIf you purchased the Star Analyser 200 as a standalone grating without any housing, then yes, you will need this kit to use it with your telescope and camera. If you purchased a version of the Star Analyser that was already mounted in a cell, you do not need this kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the mounting kit help me get a spectrum of a star like Vega (Alpha Lyrae)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy securing the Star Analyser 200 grating in your optical path, this kit allows you to capture the dispersed light from a bright star. When you image Vega through the mounted grating, its light is spread into a spectrum, revealing absorption lines like the Balmer series of hydrogen, which are characteristic fingerprints of the star's composition and temperature.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Star Analyser 200 mounting kit compatible with a filter wheel on my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is one of its primary functions. The mounting kit is designed to create a cell with standard filter threads, allowing you to install the Star Analyser 200 into an empty slot in your filter wheel. This makes it easy to switch between standard imaging and spectroscopy during an observing session with your Schmidt-Cassegrain or other telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the mounting kit include the Star Analyser 200 grating itself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this product is only the mounting kit (the housing). The Star Analyser 200 diffraction grating must be purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat tools are needed to install the grating into the Star Analyser 200 mounting kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is typically straightforward and requires minimal tools, often just a retaining ring spanner or a similar tool to secure the grating inside the cell. Always handle the grating by its edges to avoid touching the optical surface.\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\u003eSpecifications\u003c\/td\u003e\n\u003ctd\u003eNo specifications available for this product.\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\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Star_Analyser_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 Star Analyser 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":52943029764381,"sku":"SHK-EL0166","price":63.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Star-Analyser-mounting-kit-1_8663a2dc-6413-493e-b61c-05045f0312d8.jpg?v=1789615891"},{"product_id":"shelyak-op0094","title":"Shelyak Prism 3.8° for the Star Analyser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e3.8° prism angle precisely calculated for the Star Analyser\u003c\/li\u003e\n\u003cli\u003eImproves spectral resolution by approximately 20%\u003c\/li\u003e\n\u003cli\u003eAchieves a resolving power of R~130\u003c\/li\u003e\n\u003cli\u003eCorrects optical coma inherent in converging beam setups\u003c\/li\u003e\n\u003cli\u003eOptimized for advanced applications like nova and supernova characterization\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\u003ePrism 3.8° for the Star Analyser\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak Prism 3.8° for the Star Analyser is an optical enhancement designed to increase its resolving power by approximately 20%. This accessory corrects for coma inherent in the Star Analyser's simple design, pushing its performance to a resolving power of R~130. By adding this 3.8° prism, you can extract more detailed spectral data from your existing setup.\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\u003eCorrect Coma and Boost Resolution by 20% to R~130\u003c\/h3\u003e\n\u003cp\u003eThe Star Analyser's effectiveness comes from its simplicity—placing a diffraction grating directly into a telescope's converging light path. However, this introduces optical coma, which can soften spectral lines. The 3.8° Prism is specifically calculated to counteract this aberration, resulting in a sharper spectrum and an approximate 20% improvement in resolving power, achieving R~130.\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\u003eIs the 3.8° Prism Necessary for Your Spectroscopy?\u003c\/h3\u003e\n\u003cp\u003eThis prism is not a requirement for everyone. If you are using the Star Analyser to explore the basics of spectroscopy, the standard configuration is more than sufficient. However, if your goal is to push the instrument to its analytical limits for scientific contribution—such as characterizing the spectral evolution of novae or supernovae—this 3.8° prism is an essential upgrade.\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 main purpose of the Prism 3.8° for the Star Analyser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the 3.8° Prism is to improve the optical quality and resolution of spectra produced by a Star Analyser grating. It specifically corrects for \u003cstrong\u003ecoma\u003c\/strong\u003e, an aberration introduced when the grating is placed in a converging telescope beam, boosting resolution by about \u003cstrong\u003e20% to R~130\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 3.8° Prism for the Star Analyser improve resolution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe prism works by pre-correcting the light path before it reaches the diffraction grating. Its \u003cstrong\u003e3.8° wedge angle\u003c\/strong\u003e is precisely calculated to cancel out the coma that the simple, in-beam placement of the Star Analyser would otherwise create. This results in sharper, better-defined spectral lines and therefore higher effective resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need this 3.8° Prism if I'm just starting with spectroscopy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this prism is generally not necessary for beginners. The standard Star Analyser is an excellent tool for learning and discovering spectroscopy. This 3.8° prism is an upgrade for users who want to push the Star Analyser to its maximum performance for more demanding applications, like pro-am collaborations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 3.8° Prism to study the spectrum of a bright supernova like SN 2023ixf?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal application. Characterizing novae and supernovae is a key use case for this prism. The increased resolution to \u003cstrong\u003eR~130\u003c\/strong\u003e allows for better identification and monitoring of spectral features as the event evolves, providing more valuable scientific data than the Star Analyser could achieve on its own.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of optical aberration does the Prism 3.8° correct in my f\/8 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe prism is designed to correct for \u003cstrong\u003ecoma\u003c\/strong\u003e that is introduced by the Star Analyser itself, not the telescope. When you place the grating in the converging f\/8 light cone of your SCT, coma is created. The 3.8° Prism is engineered to minimize this specific aberration, leading to a cleaner spectrum regardless of your telescope's native optical quality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 3.8° Prism for the Star Analyser change how I process my spectra?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe prism does not fundamentally change the data acquisition or processing workflow. You will still capture and calibrate your spectra using the same software (like Demetra). The primary difference will be in the final result: you will start with a sharper raw image, allowing for a more precise and higher-resolution final spectral profile.\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_Star_Analyser_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 Star Analyser 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":52943034614045,"sku":"SHK-OP0094","price":113.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Prism-3-8-for-the-Star-Analyser-1_4033f785-10e6-4816-acc7-23ef1ad0c1cf.jpg?v=1789616029"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/shelyak-star-analyser-grating-filters.oembed","provider":"David Astro","version":"1.0","type":"link"}