{"product_id":"shelyak-se0145","title":"Shelyak Photometric Slit 23\/200µm for Alpy 600 \u0026 UVEX","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual slit design with 23µm and 200µm widths\u003c\/li\u003e\n\u003cli\u003eEnables high-resolution spectroscopy and spectrophotometry\u003c\/li\u003e\n\u003cli\u003eDesigned for Shelyak Alpy 600 and UVEX spectroscopes\u003c\/li\u003e\n\u003cli\u003eRequires the Alpy Guiding Module for operation\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\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\u003ePhotometric Slit 23\/200µm for Alpy 600 \u0026amp; UVEX\u003c\/h2\u003e\n\u003cp\u003eThis Photometric Slit for Alpy 600 and UVEX spectroscopes enables true spectrophotometry by integrating two distinct apertures in a single component: a narrow 23µm slit for maximum resolution and a wide 200µm slit for capturing total stellar flux.\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 23µm \/ 200µm Slit: A Dual-Purpose Tool for Spectrophotometry\u003c\/h3\u003e\n\u003cp\u003eThis accessory allows you to switch between two fundamental modes of spectroscopic observation without changing hardware. The 23µm slit provides the narrowest aperture, maximizing the spectral resolution of your Alpy 600 or UVEX to resolve fine details in stellar spectra. When your goal is to measure the precise brightness of an object across different wavelengths—true spectrophotometry—the wider 200µm slit ensures that all the light from the star enters the spectroscope, even in moments of poor seeing, for an accurate flux measurement.\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 dual slits on the 23\/200µm Photometric Slit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe two slits serve two different scientific goals. The narrow \u003cstrong\u003e23µm slit\u003c\/strong\u003e is used to achieve the highest possible spectral resolution for detecting fine absorption or emission lines. The wide \u003cstrong\u003e200µm slit\u003c\/strong\u003e is used for spectrophotometry, where the goal is to capture all of a star's light to accurately measure its brightness, sacrificing some resolution for photometric precision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the 23µm slit with my Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUse the 23µm slit when your primary objective is resolving detail in a spectrum. This is ideal for classifying star types, identifying chemical compositions, or measuring the doppler shift of spectral lines in objects like binary stars or quasars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen is the 200µm slit the right choice for the Photometric Slit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 200µm slit is essential for spectrophotometry. If you are studying variable stars, supernovae, or any object where you need to create an accurate spectral energy distribution curve, the wide slit ensures you are measuring the total energy output of the star without light loss at the aperture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Photometric Slit compatible with all Shelyak spectrographs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this slit is specifically designed for use with the \u003cstrong\u003eShelyak Alpy 600\u003c\/strong\u003e and \u003cstrong\u003eShelyak UVEX\u003c\/strong\u003e spectroscope models. It is not compatible with other instruments like the Lhires III or LISA.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need other accessories to use the 23\/200µm Photometric Slit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this photometric slit must be used with the \u003cstrong\u003eAlpy Guiding Module\u003c\/strong\u003e. The guiding module is required to position the target star accurately on the desired slit and maintain that position during an exposure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 200µm slit on the Photometric Slit help with poor seeing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAtmospheric turbulence (seeing) causes a star's image to move and swell. A narrow slit can block some of this light as the star image shifts, leading to an inaccurate brightness measurement. The wide 200µm slit provides a large enough opening to contain the entire star image even under poor seeing conditions, ensuring all its light enters the spectroscope for a valid photometric reading.\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\u003eSlit Widths\u003c\/td\u003e\n\u003ctd\u003e23µm (High Resolution) \/ 200µm (Photometry)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Function\u003c\/td\u003e\n\u003ctd\u003eSpectrophotometry \u0026amp; High-Resolution Spectroscopy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Alpy 600, Shelyak UVEX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Accessory\u003c\/td\u003e\n\u003ctd\u003eAlpy Guiding Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/shelyak-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eShelyak 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":52943048638749,"sku":"SHK-SE0145","price":221.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Photometric-slit-23-200-m-1_d73fed93-587d-42fe-8a9a-5716c60391fd.jpg?v=1789616359","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-se0145","provider":"David Astro","version":"1.0","type":"link"}