{"product_id":"shelyak-se0005","title":"Shelyak Grating module for the Lhires III - 2400 l\/mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eGrating Ruling: 2400 lines\/mm\u003c\/li\u003e\n\u003cli\u003eInstrument Compatibility: Shelyak Lhires III Spectroscope\u003c\/li\u003e\n\u003cli\u003ePrimary Application: High-Resolution Spectroscopy\u003c\/li\u003e\n\u003cli\u003eFunction: Direct replacement for the standard Lhires III grating\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 Lhires III - 2400 l\/mm\u003c\/h2\u003e\n\u003cp\u003eThis is the standard, high-resolution grating module for the Shelyak Lhires III spectroscope, featuring a 2400 lines\/mm ruling. The Lhires III instrument is supplied from the factory with this 2400 l\/mm grating to deliver its maximum native resolving power.\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 Standard 2400 l\/mm High-Resolution Grating for Lhires III\u003c\/h3\u003e\n\u003cp\u003eEngineered as the default optical component for the Lhires III, this 2400 lines\/mm grating module is the key to achieving the instrument's highest spectral resolution. It is designed for detailed analysis of stellar atmospheres, Be star emission lines, and other targets requiring fine spectral detail.\u003c\/p\u003e\n\u003cp\u003eThis module serves as a direct replacement for the original grating included with your Lhires III. While other complementary gratings are available to change the instrument's resolution for different applications, the 2400 l\/mm version remains the primary choice for high-resolution work.\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 purpose of the 2400 l\/mm grating for the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2400 lines\/mm grating\u003c\/strong\u003e is designed to provide the highest possible spectral resolution for the Lhires III spectroscope. It is intended for scientific applications where resolving fine details in a star's spectrum is critical, such as measuring doppler shifts or analyzing narrow emission and absorption lines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this 2400 l\/mm grating an upgrade for the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is not an upgrade. The Shelyak Lhires III spectroscope is sold with the \u003cstrong\u003e2400 l\/mm grating module\u003c\/strong\u003e as its standard component. This product is a direct, factory-spec replacement for a lost or damaged original grating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I need to replace the 2400 l\/mm grating on my Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would typically purchase this module only if the original grating that came with your Lhires III was damaged, degraded, or lost. Since it is the standard grating, this module ensures your instrument is restored to its original high-resolution capabilities.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 2400 l\/mm grating perform on a Be star like Gamma Cassiopeiae?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe high resolution of the \u003cstrong\u003e2400 l\/mm grating\u003c\/strong\u003e is ideal for studying Be stars like Gamma Cassiopeiae (γ Cas). It allows you to clearly resolve the double-peaked profile of the Hydrogen-alpha (Hα) emission line, which originates from the star's circumstellar disk. This level of detail is essential for monitoring V\/R (violet-to-red peak) variations and changes in the disk structure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use a lower-resolution grating instead of this 2400 l\/mm module for my Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the \u003cstrong\u003e2400 l\/mm grating\u003c\/strong\u003e provides maximum detail, it covers a very small spectral range. You should switch to a lower-resolution grating (e.g., 600 or 1200 l\/mm) when you need to:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapture a wider wavelength range\u003c\/strong\u003e in a single exposure, such as when classifying star types.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStudy faint objects\u003c\/strong\u003e like quasars or supernovae, where collecting more light over a broader band is more important than high resolution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerform initial surveys\u003c\/strong\u003e of targets before focusing on a specific spectral line with the high-resolution grating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it difficult to install the 2400 l\/mm grating module in the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the grating modules for the Lhires III are designed to be user-interchangeable. The process involves opening the instrument cover and carefully swapping the modules. Refer to the official Lhires III user manual for detailed, step-by-step instructions to ensure proper handling and alignment.\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_Lhires_III_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 Lhires III 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":52943042412829,"sku":"SHK-SE0005","price":750.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Grating-module-for-the-Lhires-III-2400-l-mm-1_90238cf8-88d4-4d27-85e3-f830bc715a3d.jpg?v=1789616196","url":"https:\/\/davidastro.com\/fr-us\/products\/shelyak-se0005","provider":"David Astro","version":"1.0","type":"link"}