{"product_id":"shelyak-se0253","title":"Shelyak 10 µm Mirror Slit for Shelyak Spectrographs","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e10 µm Slit Width\u003c\/li\u003e\n\u003cli\u003eHigh-Reflectivity Mirror Finish\u003c\/li\u003e\n\u003cli\u003eCompatible with Shelyak Alpy Spectrographs\u003c\/li\u003e\n\u003cli\u003eCompatible with Shelyak UVEX Spectrographs\u003c\/li\u003e\n\u003cli\u003eCompatible with Shelyak Sol'Ex Spectrographs\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\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\u003e10 µm Mirror Slit for Shelyak Spectrographs\u003c\/h2\u003e\n      \u003cp\u003eThis 10 µm mirror slit is an optional accessory engineered for achieving the highest possible spectral resolution with Shelyak Alpy, UVEX, and Sol'Ex spectrographs. By narrowing the input aperture to just 10 µm, this slit allows you to resolve fine details in stellar spectra that are inaccessible with wider, standard-issue slits.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 10 µm Slit: Maximizing Spectral Resolution for Alpy, UVEX, and Sol'Ex\u003c\/h3\u003e\n      \u003cp\u003eIn spectroscopy, the width of the entrance slit is a primary factor controlling spectral resolution. This 10 µm slit provides a significantly narrower aperture than the standard slits included with most spectrographs, directly translating to a higher resolving power. This is critical for scientific applications like measuring the Doppler shift of close binary stars or identifying subtle absorption features in the atmospheres of Be stars.\u003c\/p\u003e\n      \u003cp\u003eThe mirror finish serves a dual purpose: it reflects over 95% of the starlight that does not pass through the slit back to your guide camera, making target centering and guiding significantly easier. This is especially important when using such a narrow slit, as precise alignment on the target is paramount for maintaining signal.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eChoosing the Right Slit: The 10 µm vs. 23 µm Trade-Off\u003c\/h3\u003e\n      \u003cp\u003eWhile the 10 µm slit maximizes resolution, it does so at the cost of light throughput. It is the ideal choice for bright targets under conditions of excellent atmospheric seeing. For fainter objects or nights with poor seeing, a wider slit is often a more practical choice.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n          \u003cstrong\u003e10 µm Slit:\u003c\/strong\u003e Best for high-resolution studies of bright stars (Magnitude 6 or brighter), solar spectroscopy with Sol'Ex, and separating close spectral lines. Requires excellent guiding and stable seeing conditions.\u003c\/li\u003e\n        \u003cli\u003e\n          \u003cstrong\u003eStandard 23 µm Slit:\u003c\/strong\u003e A better all-around option for general spectroscopy, fainter targets like quasars and nebulae, and nights of average seeing. It gathers more light, improving the signal-to-noise ratio on faint sources at the expense of lower resolution.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary advantage of the 10 µm mirror slit for a Shelyak spectrograph?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary advantage is \u003cstrong\u003emaximum spectral resolution\u003c\/strong\u003e. The 10 µm width allows the spectrograph, whether it's an Alpy, UVEX, or Sol'Ex, to resolve finer details in a spectrum compared to wider slits. This is essential for scientific work where separating closely spaced emission or absorption lines is the main objective.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the 10 µm slit instead of the standard 23 µm slit on my Alpy 600?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou should use the 10 µm slit on your Alpy 600 when observing \u003cstrong\u003ebright stars under excellent seeing conditions\u003c\/strong\u003e. For example, when attempting to split the sodium D lines or measuring the radial velocity of a star like Vega (Alpha Lyrae), the 10 µm slit will provide the best results. For fainter deep-sky objects or nights with turbulent seeing, the 23 µm slit is a better choice as it will collect more light and be more forgiving of guiding errors.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 10 µm slit make my spectra dimmer?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. A narrower slit physically blocks more of the star's light from entering the spectrograph. The 10 µm slit will result in a lower signal-to-noise ratio for a given exposure time compared to a wider slit. This trade-off is fundamental: you exchange brightness for higher resolution.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does seeing affect performance with the 10 µm slit when observing binary stars like Albireo?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003ePoor seeing (atmospheric turbulence) causes the star's image to blur and wander. With a very narrow 10 µm slit, the star's image can easily move partially or completely off the slit, causing dramatic drops in signal and making it very difficult to acquire a usable spectrum. For this reason, the 10 µm slit is recommended only for nights with stable, calm air, where the star's image remains small and steady on the slit.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 10 µm slit compatible with all Alpy, UVEX, and Sol'Ex models?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this slit is designed to be fully compatible with the standard slit holders used in the Shelyak Instruments \u003cstrong\u003eAlpy\u003c\/strong\u003e, \u003cstrong\u003eUVEX\u003c\/strong\u003e, and \u003cstrong\u003eSol'Ex\u003c\/strong\u003e spectrograph families. It can be interchanged with other slits of different widths depending on your observing goals.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this 10 µm slit require special focusing or guiding procedures?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it demands more precision. You must achieve critical focus of the star on the slit plane itself. Because the slit is so narrow, guiding must be very accurate to keep the star centered. The mirror surface of the slit greatly aids in this, as it reflects the surrounding starfield back to your autoguider, allowing you to guide directly on the target star's position relative to the slit.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSlit Width\u003c\/td\u003e\n\u003ctd\u003e10 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Alpy, UVEX, Sol'Ex\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eReflective Mirror Slit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\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\"\u003e10 µm Mirror Slit\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\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":52943053914397,"sku":"SHK-SE0253","price":128.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-10-m-mirror-slit-1_80ed63aa-2dcc-4012-b163-9fb751695000.jpg?v=1789616509","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-se0253","provider":"David Astro","version":"1.0","type":"link"}