{"product_id":"shelyak-se0007","title":"Shelyak Grating module for the Lhires III - 600 l\/mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrating Density:\u003c\/strong\u003e 600 lines\/mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstrument Compatibility:\u003c\/strong\u003e Shelyak Lhires III Spectroscope\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Application:\u003c\/strong\u003e Low-resolution, wide-band spectroscopy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Expands the Lhires III's capabilities for observing faint, broad-emission objects\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\u003eGrating module for the Lhires III - 600 l\/mm\u003c\/h2\u003e\n\u003cp\u003eThis 600 lines\/mm grating module fundamentally alters the capabilities of your Lhires III spectroscope, trading the high resolution of the standard 2400 l\/mm grating for significantly broader wavelength coverage in a single exposure. It transforms the Lhires III from a specialized high-resolution instrument into a more versatile tool for surveying a wider range of celestial targets.\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 Core Trade-Off: Swapping Resolution for Broad Spectral Range\u003c\/h3\u003e\n\u003cp\u003eIn spectroscopy, resolution and spectral range are inversely related. The standard 2400 l\/mm grating disperses light widely to resolve fine details, but can only capture a narrow slice of the spectrum. This 600 l\/mm grating module does the opposite, concentrating the spectrum to fit a much wider range of wavelengths onto your sensor at the expense of resolving power.\u003c\/p\u003e\n\u003cp\u003eThis lower dispersion makes the 600 l\/mm grating ideal for initial characterization of unknown objects or for studying phenomena that span the entire visible spectrum. It also increases throughput, delivering a brighter spectrum that is critical for faint targets.\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\u003eNew Targets for Your Lhires III: From Novae to Comets\u003c\/h3\u003e\n\u003cp\u003eBy prioritizing spectral range over detail, this module opens up new observational possibilities for the Lhires III. It allows you to effectively study objects with broad emission or absorption features that are difficult to analyze with a high-resolution grating.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransient Events:\u003c\/strong\u003e Capture the entire visible spectrum of a supernova or nova in a single shot to classify its type and evolution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComets:\u003c\/strong\u003e Analyze the broad emission bands from molecules like C2 (Swan bands) in a comet's coma.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission Nebulae:\u003c\/strong\u003e Measure the relative intensities of key emission lines (like H-alpha, H-beta, and OIII) across a wide spectral range simultaneously.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e600 l\/mm vs. the Standard 2400 l\/mm Grating\u003c\/h3\u003e\n\u003cp\u003eChoosing the right grating depends entirely on your scientific goal. This 600 l\/mm module complements the stock grating, giving your Lhires III dual-mode capability.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 l\/mm Grating (This Module):\u003c\/strong\u003e Best for low-resolution survey work, spectral classification, and observing faint, extended objects. It captures a wide spectral range, ideal for understanding the overall nature of a target.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2400 l\/mm Grating (Standard):\u003c\/strong\u003e Best for high-resolution studies of specific, narrow spectral lines. It is the tool for measuring precise Doppler shifts to determine stellar radial velocities or for analyzing the detailed profiles of absorption lines in bright stars.\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 main reason to use the 600 l\/mm grating in my Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary reason is to capture a much \u003cstrong\u003ewider range of wavelengths\u003c\/strong\u003e in a single image. While the standard 2400 l\/mm grating provides very high resolution for studying fine details, this 600 l\/mm grating is designed for survey work, classifying objects like supernovae, or studying targets with broad emission features like comets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 600 l\/mm grating change my Lhires III's view of a bright star like Vega (Alpha Lyrae)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the standard 2400 l\/mm grating, you might focus on the detailed shape of a single hydrogen line (like H-alpha) in Vega's spectrum. With the 600 l\/mm grating, you would see the entire Balmer series of hydrogen lines across the visible spectrum at once, along with Vega's overall spectral curve, but with much less detail in each individual line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 600 l\/mm grating to study the spectrum of a comet?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal application. Comets often show broad emission bands from various molecules. The 600 l\/mm grating allows you to capture these features across a wide spectral range, which is perfect for identifying the comet's chemical composition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 600 l\/mm grating module difficult to install in the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the Lhires III was designed for interchangeable grating modules. The process is straightforward, allowing you to swap between high and low-resolution modes depending on your observing target for the night. Refer to the Lhires III manual for detailed instructions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 600 l\/mm grating work with other spectroscopes besides the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis module is specifically designed and mounted for the Shelyak Lhires III spectroscope. It is not intended for use in other instruments due to its specific mechanical interface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes lower resolution mean lower quality data with the 600 l\/mm grating?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot at all. \"Resolution\" refers to the ability to separate closely spaced spectral lines. Lower resolution is a deliberate choice to achieve a different scientific goal—namely, wider spectral coverage. For tasks like classifying a supernova or measuring the overall color of an asteroid, the data from the 600 l\/mm grating is not only high quality but is the more appropriate choice.\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\u003eGrating Density\u003c\/td\u003e\n\u003ctd\u003e600 lines\/mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Instrument\u003c\/td\u003e\n\u003ctd\u003eShelyak Lhires III Spectroscope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution Class\u003c\/td\u003e\n\u003ctd\u003eLow Resolution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpectral Coverage\u003c\/td\u003e\n\u003ctd\u003eWide Band\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\"\u003e600 l\/mm Grating Module for Lhires III\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\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:\/\/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":52943043068189,"sku":"SHK-SE0007","price":738.0,"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_6e2fbb50-e60f-4907-985d-753b59101eb6.jpg?v=1789616212","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-se0007","provider":"David Astro","version":"1.0","type":"link"}