{"product_id":"shelyak-se0243","title":"Shelyak Grating module for the UVEX - 300 l\/mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e300 lines\/mm Grating Density\u003c\/li\u003e\n\u003cli\u003eOptional Interchangeable Module\u003c\/li\u003e\n\u003cli\u003eDesigned for the Shelyak UVEX Spectroscope\u003c\/li\u003e\n\u003cli\u003eLower Resolution, Wider Spectral Coverage\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 UVEX - 300 l\/mm\u003c\/h2\u003e\n\u003cp\u003eThis optional Grating Module for the Shelyak UVEX spectroscope features a line density of 300 lines\/mm, offering a different balance of resolution and spectral coverage compared to the standard 600 l\/mm grating. It is a key component in a modular system that includes gratings from 150 l\/mm up to 1800 l\/mm, allowing you to tailor the instrument's capabilities to specific scientific 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 300 l\/mm Grating: Balancing Resolution and Spectral Range\u003c\/h3\u003e\n\u003cp\u003eIn spectroscopy, grating choice dictates a fundamental trade-off. The 300 lines\/mm grating disperses incoming light less aggressively than higher-density gratings. This results in lower spectral resolution but allows a significantly wider range of wavelengths to fit onto your camera's sensor in a single exposure.\u003c\/p\u003e\n\u003cp\u003eThis capability is critical for survey work, initial classification of variable stars or supernovae, and studying objects with very broad spectral features. For faint targets, concentrating the light over a smaller sensor area can also improve the signal-to-noise ratio for the overall spectrum, making it a valuable tool for capturing data on challenging 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\u003eChoosing Your Grating: 300 l\/mm vs. the 600 l\/mm Standard\u003c\/h3\u003e\n\u003cp\u003eWhile the UVEX's standard 600 l\/mm grating provides an excellent general-purpose balance for many projects, the 300 l\/mm module serves a specific and complementary role. You would choose the 300 l\/mm grating when your scientific goal prioritizes wavelength coverage over fine detail.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 l\/mm Grating:\u003c\/strong\u003e Best for wide-field spectroscopy. Use it to capture the full spectrum of a nova from the hydrogen-alpha to hydrogen-beta lines in one frame, or for classifying multiple stars in a cluster simultaneously.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 l\/mm Grating (Standard):\u003c\/strong\u003e The versatile workhorse. Ideal for resolving the double-peaked emission lines in Be stars or studying the detailed structure of planetary nebulae spectra.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Density Gratings (1200\/1800 l\/mm):\u003c\/strong\u003e These are reserved for high-resolution studies of single, narrow spectral lines, such as measuring the radial velocity of a star via Doppler shift.\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 use for the Shelyak UVEX 300 l\/mm grating?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 300 l\/mm grating is designed for low-resolution spectroscopy where capturing a wide range of wavelengths in a single image is more important than resolving fine details. It is ideal for survey projects, classifying unknown objects, and studying targets with broad spectral features like supernovae or novae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 300 l\/mm grating compare to the standard 600 l\/mm grating included with the UVEX?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 300 l\/mm grating provides half the spectral resolution of the standard 600 l\/mm grating. In exchange, it covers a much wider spectral range on the same sensor. The 600 l\/mm is a general-purpose tool for detailed analysis, while the 300 l\/mm is a specialized tool for wide-field spectroscopic surveys.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen would I choose the 300 l\/mm grating for observing a nova like Nova Persei (GK Persei)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a nova, especially in its early, rapidly evolving stages, the 300 l\/mm grating is an excellent choice. It allows you to capture the entire visible spectrum, including the broad P Cygni profiles and multiple emission lines (like the Balmer series), in a single exposure to monitor its overall evolution. A higher-resolution grating might require multiple exposures and mosaicking to cover the same range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 300 l\/mm grating fit my Shelyak UVEX spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This grating is specifically designed as an interchangeable module for the Shelyak UVEX spectroscope, allowing you to easily swap it with the standard 600 l\/mm grating or other optional gratings in the series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 300 l\/mm grating better for faint objects than the 1200 l\/mm grating?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for capturing a detectable spectrum. The 300 l\/mm grating concentrates the faint light over a smaller area on the sensor, improving the signal-to-noise ratio of the overall spectrum. The 1200 l\/mm grating spreads that same faint light out much further, which can make the resulting high-resolution spectrum too dim to be useful without very long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 300 l\/mm grating to measure the redshift of a quasar like 3C 273?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent application for the 300 l\/mm grating. The broad emission lines of a quasar like 3C 273 are easily visible at this resolution, and the wide spectral coverage helps you identify multiple lines to confirm the redshift. The goal is to identify the pattern of shifted lines, not to resolve their internal structure, making low resolution ideal.\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\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eGrating Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstrument\u003c\/td\u003e\n\u003ctd\u003eShelyak UVEX Spectroscope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrating Density\u003c\/td\u003e\n\u003ctd\u003e300 lines\/mm\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\"\u003eGrating Module for UVEX (300 l\/mm)\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_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":52943052275997,"sku":"SHK-SE0243","price":719.0,"currency_code":"USD","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_b112a085-7d93-4f03-a91a-1d652c44b9a9.jpg?v=1789616467","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-se0243","provider":"David Astro","version":"1.0","type":"link"}