{"product_id":"shelyak-se0246","title":"Shelyak Grating module for the UVEX - 1800 l\/mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eGrating Density: 1800 lines\/mm\u003c\/li\u003e\n\u003cli\u003eInstrument Compatibility: Shelyak UVEX Spectroscope\u003c\/li\u003e\n\u003cli\u003ePrimary Application: High-resolution spectroscopy\u003c\/li\u003e\n\u003cli\u003eModular Design: Interchangeable with other UVEX gratings\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\u003eGrating module for the UVEX - 1800 l\/mm\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak Grating Module for the UVEX elevates your spectroscope's capabilities with a line density of 1800 lines per millimeter (l\/mm). This module offers three times the line count of the standard 600 l\/mm grating included with the UVEX, delivering the highest possible spectral dispersion and resolution available for the 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\u003e1800 l\/mm: The Highest Resolution for UVEX Spectroscopy\u003c\/h3\u003e\n\u003cp\u003eThis grating is a specialized tool designed for maximum detail. The high 1800 l\/mm density spreads starlight across a greater number of pixels, allowing you to resolve extremely fine spectral features that are invisible with lower-dispersion gratings. It is the ideal choice for advanced projects like measuring the Doppler shift in binary star systems, analyzing the detailed atmospheric lines of bright stars, or separating close emission lines in planetary nebulae.\u003c\/p\u003e\n\u003cp\u003eThe trade-off for this high resolution is a reduction in brightness and a narrower spectral range captured in a single exposure. This makes the 1800 l\/mm grating best suited for brighter targets where photon signal is abundant and fine detail is the primary scientific goal.\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 5-Grating UVEX Modular System\u003c\/h3\u003e\n\u003cp\u003eThe UVEX spectroscope is engineered around a modular, user-interchangeable grating system. This allows you to adapt the instrument's resolution to match your specific target and observing conditions. The 1800 l\/mm grating represents the pinnacle of this system for high-resolution work.\u003c\/p\u003e\n\u003cp\u003eYou can easily swap it with the standard 600 l\/mm grating or other optional modules, including the 150, 300, and 1200 l\/mm versions. This flexibility transforms the UVEX from a single instrument into a versatile analytical platform, capable of everything from low-resolution surveys of faint objects to high-precision analysis of bright stars.\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\u003e1800 l\/mm vs. 600 l\/mm: Choosing the Right Dispersion\u003c\/h3\u003e\n\u003cp\u003eSelecting the correct grating is critical for successful spectroscopy. The choice between the optional 1800 l\/mm module and the standard 600 l\/mm grating depends entirely on your target.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 600 l\/mm Grating:\u003c\/strong\u003e This is the workhorse for general spectroscopy. It produces brighter spectra and captures a wider range of wavelengths in one shot, making it ideal for classifying stars, observing fainter objects like supernovae, or conducting initial survey work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional 1800 l\/mm Grating:\u003c\/strong\u003e This is a specialist's tool. Use it when you have a bright target and a specific scientific question that requires resolving very fine details. It prioritizes resolution over all other factors.\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 the primary advantage of the 1800 l\/mm grating for the UVEX?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its \u003cstrong\u003ehigh spectral resolution\u003c\/strong\u003e. With 1800 lines per millimeter, it spreads light out more than any other UVEX grating, allowing you to resolve very fine, closely spaced details in a spectrum that would be blurred together at lower dispersions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen would I use the 1800 l\/mm grating to observe a star like Vega (Alpha Lyrae)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a bright A-type star like Vega, the 1800 l\/mm grating would be excellent for studying the detailed profile of its prominent hydrogen absorption lines (the Balmer series). The high resolution would allow you to detect subtle asymmetries or Doppler shifts caused by stellar rotation or other atmospheric phenomena.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes using the 1800 l\/mm grating have any disadvantages compared to the standard 600 l\/mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Because the light is spread out more, the resulting spectrum is \u003cstrong\u003edimmer\u003c\/strong\u003e and covers a \u003cstrong\u003enarrower wavelength range\u003c\/strong\u003e in a single image. This means it requires longer exposure times or brighter targets and may require taking multiple images to cover the same spectral range as the 600 l\/mm grating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow difficult is it to install the 1800 l\/mm grating module in the UVEX spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe UVEX is designed for user-swappable gratings. The process is straightforward and involves removing the access panel and carefully exchanging the modules. For detailed instructions, please refer to the main Shelyak UVEX instrument manual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the UVEX 1800 l\/mm grating to study a faint galaxy like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is not recommended. The high dispersion of the 1800 l\/mm grating would spread the very faint light from M51 too thinly, resulting in an unusable spectrum with a very low signal-to-noise ratio. A low-dispersion grating, like the standard 600 l\/mm or optional 150 l\/mm, is required for such faint, extended objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat other gratings are available for the Shelyak UVEX?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe UVEX modular system includes a family of gratings to suit different scientific goals. In addition to the standard 600 l\/mm and this 1800 l\/mm module, Shelyak offers optional gratings of \u003cstrong\u003e150 l\/mm\u003c\/strong\u003e, \u003cstrong\u003e300 l\/mm\u003c\/strong\u003e, and \u003cstrong\u003e1200 l\/mm\u003c\/strong\u003e.\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_UVEX_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 UVEX 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":52943052800285,"sku":"SHK-SE0246","price":992.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Grating-module-for-the-UVEX-150-l-mm-1_3dc2d9fa-d61e-4483-9460-b6cf48cfa251.jpg?v=1789616483","url":"https:\/\/davidastro.com\/products\/shelyak-se0246","provider":"David Astro","version":"1.0","type":"link"}