{"title":"Spectroscopes Shelyak Alpy","description":"\u003cp\u003eLes spectroscopes Shelyak Alpy sont des spectroscopes à fente longue compacts et modulaires, pour la spectroscopie amateur et pédagogique des étoiles, nébuleuses et comètes. L'Alpy 600 donne des spectres à basse résolution sur tout le visible, et l'Alpy 200, de plus basse résolution, vise les cibles plus faibles.\u003c\/p\u003e\u003cp\u003eLes modules permettent de composer l'instrument voulu : module de guidage avec miroir à fente, module de calibration pour la référence en longueur d'onde, lentille de Barlow, fentes de 23 µm à 50 µm et adaptateurs caméra monture C ou ST8\/10.\u003c\/p\u003e","products":[{"product_id":"shelyak-alpy-600-spectroscope","title":"Spectroscope Shelyak Alpy 600","description":"\u003c!-- more --\u003e\u003cdiv\u003e Les logiciels Alpy 600 et \u003ca href=\"https:\/\/www.shelyak.com\/logiciel-demetra\/logiciel-demetra\/?lang=en\"\u003eDemetra\u003c\/a\u003e (développés par Shelyak Instrument pour le spectrographe ALPY 600) vous permettront de produire des spectres scientifiquement exploitables.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e L'Alpy 600 vous ouvre les portes de l'Astrophysique : explorez différents types d'objets stellaires (étoiles, galaxies, nébuleuses, planètes, comètes...), comparez les différents types spectraux, observez les raies d'absorption et d'émission, voyez comment (certaines) étoiles évoluent de d'un jour à l'autre - les possibilités sont illimitées.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e \u003cdiv\u003eL'Alpy 600 est un spectroscope à fente \u003cstrong\u003eperformant\u003c\/strong\u003e , \u003cstrong\u003emodulaire, compact\u003c\/strong\u003e (quelques cm de long) et \u003cstrong\u003esimple d'utilisation\u003c\/strong\u003e . Ces spécifications le rendent idéal pour débuter en spectroscopie astronomique… mais pas seulement. Ce véritable instrument scientifique, et vous accompagnera longtemps.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003cspan\u003eSon pouvoir de résolution (R=600) lui permet de couvrir tout le domaine visible et même plus (de 375nm dans le proche UV à 750 nm dans le proche IR). Vous pourrez distinguer de nombreux détails dans le profil spectral. La résolution est de 1nm. L'élément dispersant est un grism, c'est-à-dire l'association d'un prisme et d'un réseau de diffraction (600t\/mm).\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\n \u003cdiv\u003e\u003cspan id=\"tran0\"\u003eLa \u003cstrong\u003efente\u003c\/strong\u003e permet d'isoler une frange de la source lumineuse. Elle apporte plusieurs avantages : on isole l'objet que l'on souhaite observer, on peut travailler sur des objets étendus (nébuleuses, planètes), on peut faire des spectres de lumière d'étalonnage... grâce à la fente, la qualité du spectre devient indépendante des conditions d'observation (voir, problèmes de suivi du télescope, etc.). L'Alpy 600 est livré avec plusieurs fentes interchangeables (voir photo de gauche), pour couvrir de nombreuses situations d'observation.\u003c\/span\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e\u003cspan id=\"tran0\"\u003eLa \u003cstrong\u003ecompacité\u003c\/strong\u003e et la \u003cstrong\u003elégèreté\u003c\/strong\u003e de l'Alpy 600 le rendent compatible avec de petits instruments (télescope à partir de 80mm de diamètre), sur des montures modestes. Vous atteindrez des objets faibles en quelques minutes (voire quelques secondes) de temps d'exposition.\u003c\/span\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e\u003c\/div\u003e\n\n \u003cdiv\u003e\u003cspan id=\"tran0\"\u003eL'optique de l'Alpy 600 a été spécialement conçue pour donner la meilleure \u003cstrong\u003equalité d'image\u003c\/strong\u003e , sur tout le domaine visible, avec une grande ouverture (F\/4). Vous serez surpris de la quantité d'informations que vous pouvez extraire d'un si petit spectroscope ! Cette qualité est telle que de nombreuses publications scientifiques sont basées sur des observations avec l'Alpy 600.\u003c\/span\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":44968070545693,"sku":"SHK-PF0035","price":1349.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Shelyal-Alpy600-LowRes__29165.1671740990.1280.1280.jpg?v=1684348645"},{"product_id":"shelyak-alpy-guiding-module","title":"Module de guidage Shelyak Alpy","description":"\u003c!-- more --\u003e\u003cp\u003e\u003cspan id=\"tran0\"\u003eLe spectroscope Alpy 600 peut être utilisé sur table ou en laboratoire : dans ce cas, il suffit de placer la source lumineuse à observer devant la fente. Mais lorsque l'on veut observer le spectre d'une étoile, un problème se pose : comment savoir si l'on pointe vers la bonne étoile, et s'assurer que l'étoile est parfaitement positionnée dans la fente ?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan id=\"tran1\"\u003eLe module de guidage répond à cette question : il permet de visualiser le champ de vision du télescope, ainsi que la fente (observée par l'avant du spectroscope), avec une caméra de guidage. C'est une aide indispensable pour pointer, ainsi que pour guider et autoguider le télescope dès que votre observation dure plus de quelques secondes.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan id=\"tran0\"\u003eLe principe du module de guidage est simple : on remplace la fente standard de l'Alpy 600 par une fente miroir et légèrement inclinée, qui renvoie l'image du télescope vers la caméra de guidage (ou un oculaire, avec le porte-oculaire en option). Voir le croquis ci-dessous (extrait du livre « \u003cstrong\u003eSuccesfully Starting in Astronomical Spectroscopy – A Practical Guide »).\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":44968070611229,"sku":"SHK-PF0036","price":1557.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/PF0036-Alpy-guiding-module-T210x187_134__36715.1671741744.1280.1280.png?v=1684348649"},{"product_id":"shelyak-alpy-calibration-module","title":"Module d'étalonnage Shelyak Alpy","description":"\u003c!-- more --\u003e\u003cp\u003e \u003cspan id=\"tran0\"\u003eL'étalonnage en longueur d'onde d'un spectre nécessite d'observer le spectre d'une lumière d'étalonnage, c'est-à-dire d'une lumière à nombreuses raies d'émission dont la longueur d'onde est parfaitement connue. On peut placer une telle lampe devant le télescope, mais le module de calibration Alpy rend les choses beaucoup plus simples, et permet ainsi une grosse productivité.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e Le module de calibration Alpy embarque une lampe Argon-néon dont le spectre est parfaitement connu.\u003c\/p\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":44968070643997,"sku":"SHK-PF0037","price":1279.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/PF0037-Alpy-guiding-module-T198x210_135_w__55288.1671741838.1280.1280.png?v=1684348651"},{"product_id":"shelyak-pf0083","title":"Shelyak Alpy 200 Spectroscope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eResolving power of R~130 optimized for faint targets\u003c\/li\u003e\n\u003cli\u003eFast F\/4 optical design\u003c\/li\u003e\n\u003cli\u003eMulti-position wheel with 25µm, 50µm, 100µm, and 300µm slits\u003c\/li\u003e\n\u003cli\u003eCompact and lightweight at 65mm long and only 200g\u003c\/li\u003e\n\u003cli\u003eVariable mechanical backfocus from 10.5mm to 21mm\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\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\u003eAlpy 200 Spectroscope\u003c\/h2\u003e\n\u003cp\u003eThe Alpy 200 Spectroscope is engineered for a specific scientific purpose: capturing the spectra of extremely faint celestial objects. Its optical design delivers a resolving power of R~130 through a fast F\/4 system, prioritizing signal collection on targets like distant quasars and supernovae. The entire instrument is housed in a compact 65mm x 45mm body that weighs only 200g, making it compatible with a wide range of telescopes. A multi-position slit wheel offers options from a 25µm pinhole to a 300µm slit, while the standard T-mount (M42x0.75mm) interface accommodates science cameras with a mechanical backfocus between 10.5mm and 21mm.\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\u003eLow-Resolution Spectroscopy: An R~130 Grism for Faint Targets\u003c\/h3\u003e\n\u003cp\u003eThe core of the Alpy 200 is a 200 gr\/mm grism (grating + prism) that provides a resolving power of R~130. This low-resolution design is a deliberate trade-off, spreading the light from a faint object over fewer pixels to maximize signal-to-noise ratio. This makes it possible to acquire usable spectra on faint galaxies, novae, and supernovae that would be undetectable with higher-resolution systems. The F\/4 aperture is exceptionally fast for a spectroscope, further enhancing its sensitivity and reducing required exposure times across its operational range of 375nm to 750nm.\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\u003eMulti-Position Slit Wheel: From 25µm to 300µm\u003c\/h3\u003e\n\u003cp\u003eThe Alpy 200 incorporates a multi-position wheel with a selection of slits to adapt to different targets and observing conditions. It includes a 25µm pinhole, four slits of 25µm, 50µm, 100µm, and 300µm, and a 3mm hole for easy target acquisition. The narrower slits provide the maximum resolving power, while the wider slits are crucial for very faint targets or nights of poor seeing, ensuring more of the star's light enters the spectroscope. This flexibility allows you to optimize the instrument for everything from extended nebulae to point-like quasars.\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\u003eCompact 200g Design: Spectroscopy on an 80mm Telescope\u003c\/h3\u003e\n\u003cp\u003eWeighing just 200g and measuring 65mm in length with a 45mm diameter, the Alpy 200 is one of the most compact and lightweight scientific spectroscopes available. Its minimal weight and size mean it can be mounted on telescopes as small as 80mm in diameter without creating significant balance or stability issues. This opens the door to serious astrophysical research for observers using modest, portable mounts and optical tubes, removing the need for a heavy-duty observatory setup.\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\u003eModular System: 10.5-21mm Backfocus and Demetra Software\u003c\/h3\u003e\n\u003cp\u003eThe Alpy 200 is designed as the core of a modular system. It connects to your science camera via a standard M42x0.75mm T-mount and supports a mechanical backfocus range of 10.5mm to 21mm, compatible with many popular astronomy cameras. For a complete scientific workflow, optional autoguiding and calibration modules can be added, bringing the total required backfocus to 64mm. The entire system is supported by the free Demetra software, which handles everything from image acquisition to final data reduction.\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\u003eAlpy 200 vs. Alpy 600: Choosing Faintness Over Resolution\u003c\/h3\u003e\n\u003cp\u003eThe Alpy 200 was developed as a specialized version of its sibling, the Alpy 600, for a different observational goal. The choice between them is a direct trade-off between resolving power and sensitivity.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlpy 600 Advantage:\u003c\/strong\u003e With a resolving power of R~600, the Alpy 600 can reveal much finer detail in the spectra of bright stars, resolving closer spectral lines and enabling more detailed analysis of stellar atmospheres.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlpy 200 Advantage:\u003c\/strong\u003e The Alpy 200's R~130 resolving power concentrates the target's light, making it vastly more efficient for extremely faint objects. It is the superior choice for classifying supernovae, identifying quasars, and studying the general characteristics of faint galaxies where capturing any spectrum at all is the primary challenge.\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 kind of camera works best with the Alpy 200 Spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Alpy 200 connects via a standard \u003cstrong\u003eM42x0.75mm T-mount\u003c\/strong\u003e. It is compatible with any monochrome camera that has a mechanical backfocus between \u003cstrong\u003e10.5mm and 21mm\u003c\/strong\u003e. For optimal results, a sensor with a diagonal of 14mm or larger is recommended to capture the full spectral range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose the Alpy 200's low R~130 resolution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLow resolution is a feature, not a limitation, for faint-object spectroscopy. By spreading the light over a smaller area on the sensor, the Alpy 200 achieves a much higher signal-to-noise ratio per pixel. This allows you to obtain a usable spectrum from targets like supernovae, quasars, and faint galaxies that would be too dim to analyze with a higher-resolution spectroscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Alpy 200 to get a spectrum of a supernova in an 8-inch SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The Alpy 200's compact \u003cstrong\u003e200g\u003c\/strong\u003e weight and high sensitivity make it an ideal match for common telescopes like 8\" Schmidt-Cassegrains. This combination is powerful enough to capture spectra from very faint targets; for example, scientific data has been published on magnitude 18+ supernovae using this spectroscope on similar amateur instruments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the different slits (25µm, 50µm, 100µm, 300µm) on the Alpy 200?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe interchangeable slits allow you to adapt the spectroscope to your target and atmospheric conditions.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNarrow slits (25µm, 50µm):\u003c\/strong\u003e Provide the highest possible spectral resolution (up to R~130) for brighter objects where detail is important.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider slits (100µm, 300µm):\u003c\/strong\u003e Allow more light to enter the spectroscope, which is critical for very faint objects or when seeing is poor. This sacrifices some resolution for a much stronger signal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Alpy 200 perform on extended objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Alpy 200 is excellent for extended objects. The slit, which is \u003cstrong\u003e3mm\u003c\/strong\u003e long, allows you to isolate a specific region of the nebula. By positioning the slit across different areas—such as the Trapezium cluster versus the outer loops—you can take separate spectra to study how the physical conditions (like ionization) change across the object.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the optional guiding and calibration modules for the Alpy 200?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, they are not required to start, but they complete the scientific workflow. The base Alpy 200 module is fully functional for capturing spectra. The optional guiding module makes it easier to keep your target precisely on the slit for long exposures. The calibration module provides a reference lamp (Argon-Neon) for highly accurate wavelength calibration, which is essential for scientific measurements like redshift.\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\u003eResolving Power\u003c\/td\u003e\n\u003ctd\u003eR ~130 with 23µm slit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003eF\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlit Options\u003c\/td\u003e\n\u003ctd\u003e25µm, 50µm, 100µm, 300µm slits; 25µm \u0026amp; 3mm holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlit Length\u003c\/td\u003e\n\u003ctd\u003e3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Interface\u003c\/td\u003e\n\u003ctd\u003eT-mount (M42x0.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical Backfocus\u003c\/td\u003e\n\u003ctd\u003e10.5mm to 21mm range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Backfocus (with optional modules)\u003c\/td\u003e\n\u003ctd\u003e64mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e65mm length, 45mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200g\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\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Alpy_200_Core_Module_Assembly_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 Alpy 200 Core Module Assembly Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.shelyak.com\/software\/?lang=en\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Alpy_600_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 Alpy 600 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Alpy_Backfocus_Diagram.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 Alpy Backfocus Diagram\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Demetra_Software_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 Demetra Software 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":52943040839965,"sku":"SHK-PF0083","price":1349.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Alpy-200-Spectroscope-1_176240af-29c8-496c-99b2-dcd0a2cd3d0c.jpg?v=1789616153"},{"product_id":"shelyak-pu0149","title":"Shelyak ST8\/10 adapter for Alpy 600","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCustom adapter for SBIG ST7, ST8, ST10, and ST2000 cameras\u003c\/li\u003e\n\u003cli\u003eMounts compatible SBIG cameras to a Shelyak Alpy 600 spectroscope\u003c\/li\u003e\n\u003cli\u003eReplaces the camera's standard front plate\u003c\/li\u003e\n\u003cli\u003eSolves the mechanical backfocus incompatibility between these devices\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\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\u003eST8\/10 adapter for Alpy 600\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak ST8\/10 Adapter for Alpy 600 is the specific mechanical flange required to mount classic SBIG ST7, ST8, ST10, and ST2000 series cameras onto the Alpy 600 spectroscope. This adapter directly addresses the excessive mechanical backfocus of these cameras, which otherwise prevents a secure and focused connection.\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\u003eSolving SBIG Backfocus for Alpy 600 Spectroscopy\u003c\/h3\u003e\n\u003cp\u003eThe mechanical design of SBIG's ST7, ST8, ST10, and ST2000 cameras results in a backfocus distance that is too large for direct attachment to an Alpy 600 spectroscope. This adapter is not a simple spacer; it is a replacement front plate for the camera body. By removing the camera's original plate and installing this custom flange, you physically shorten the optical path to achieve the correct spacing for spectroscopy with the Alpy 600.\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\u003eCritical Installation and Focusing Warning for ST7\/ST8\/ST10\/ST2000 Cameras\u003c\/h3\u003e\n\u003cp\u003eWhen this adapter is installed, the front lens of the Alpy 600 spectroscope is positioned extremely close to the protective window of the CCD sensor. You must exercise extreme care when focusing the spectrum. Racking the focuser in too far can cause the Alpy's lens to make physical contact with the camera's window, risking permanent damage to both optics.\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\"\u003eWhich SBIG cameras is the ST8\/10 adapter for Alpy 600 compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is specifically designed for the SBIG ST7, ST8, ST10, and ST2000 model CCD cameras. It will not work with other SBIG models or cameras from other manufacturers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the ST8\/10 adapter necessary for using my SBIG ST7 with an Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe standard mechanical backfocus of the SBIG ST7 camera is too long to allow the Alpy 600 spectroscope to reach focus. This adapter replaces the camera's front plate, effectively reducing the distance to bring it within the Alpy's required range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the Shelyak ST8\/10 adapter on my SBIG camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation requires you to carefully remove the original front plate from your SBIG camera body. This adapter flange is then mounted in its place. This is a modification to your camera and should be done with care.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the biggest risk when using the ST8\/10 adapter with my Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary risk is optical damage during focusing. The adapter brings the Alpy's lens very close to the CCD window. You must focus slowly and carefully to avoid the two surfaces touching, which could scratch or crack the optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I want to capture the spectrum of Vega (Alpha Lyrae) with my SBIG ST8 and Alpy 600, is this adapter all I need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is the essential mechanical link between your SBIG ST8 and the Alpy 600. Once they are physically connected using this adapter, you will still need to mount the entire assembly to your telescope and proceed with standard spectroscopic acquisition procedures, including focusing and calibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Alpy 600 ST8\/10 adapter to connect my camera to other Shelyak spectroscopes like the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This adapter is engineered exclusively for the Alpy 600 spectroscope. The backfocus requirements and mechanical interfaces for other spectroscopes, like the Lhires III, are different and require their own specific adapters.\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\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Alpy 600 Spectroscope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Compatibility\u003c\/td\u003e\n\u003ctd\u003eSBIG ST7, ST8, ST10, ST2000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eCorrects mechanical backfocus for camera attachment\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\"\u003eST8\/10 adapter for Alpy 600\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":52943042085149,"sku":"SHK-PU0149","price":139.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-ST8-10-adapter-for-Alpy-600-1_4bf08066-01f7-436f-8ae7-9e98ff2ba9ea.jpg?v=1789616187"},{"product_id":"shelyak-se0128","title":"Shelyak Alpy Barlow Lens for Alpy 600 Spectroscope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables DSLR camera use with Alpy 600 spectroscope\u003c\/li\u003e\n\u003cli\u003eIncreases available backfocus for long imaging trains\u003c\/li\u003e\n\u003cli\u003eAccommodates cameras with integrated filter wheels\u003c\/li\u003e\n\u003cli\u003eScrews directly to the rear of the ALPY 600\u003c\/li\u003e\n\u003cli\u003eCorrects focus for cameras with standard T-ring spacing\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\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\u003eShelyak Alpy Barlow Lens for Alpy 600 Spectroscope\u003c\/h2\u003e\n\u003cp\u003eThis dedicated Barlow lens is the essential component for connecting a DSLR or a camera with a long backfocus requirement to the Shelyak Alpy 600 spectroscope. It solves the critical problem of insufficient backfocus, extending the focal plane to meet the standard spacing of DSLRs with T-rings and astronomy cameras equipped with filter wheels. By screwing directly onto the rear of the Alpy 600, it makes it possible to achieve a sharp, focused spectrum with imaging systems that would otherwise be incompatible.\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 Essential Adapter for DSLR Spectroscopy with Alpy 600\u003c\/h3\u003e\n\u003cp\u003eThe standard Alpy 600 has a very short backfocus distance, designed for compact, dedicated astronomy cameras. This Barlow lens modifies the optical path to significantly increase that distance, specifically to accommodate the deeper sensor position found in DSLR and mirrorless cameras. If you want to use your existing digital camera for spectroscopy, this lens is not optional—it is the required adapter to bring your camera to focus.\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\u003eAccommodating Filter Wheels and Long Imaging Trains\u003c\/h3\u003e\n\u003cp\u003eModern imaging setups often include accessories like filter wheels or off-axis guiders that add considerable length to the imaging train. This Barlow provides the necessary focal extension to accommodate these bulkier configurations. It ensures you can integrate your preferred camera and accessories with the Alpy 600 without being limited by its native backfocus, giving you the flexibility to use your primary imaging rig for scientific analysis.\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 Shelyak Alpy Barlow Lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts sole purpose is to \u003cstrong\u003eincrease the backfocus\u003c\/strong\u003e of the Shelyak Alpy 600 spectroscope. This allows you to achieve focus with cameras that have a long backfocus distance, such as DSLR cameras or astronomy cameras used with a filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need this Barlow to use my Canon or Nikon DSLR with the Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. A standard DSLR camera's sensor is located too far from the mounting flange to reach focus on a native Alpy 600. This Barlow lens is required to extend the focal point to where your DSLR sensor can capture a sharp spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Barlow help if I use a ZWO filter wheel with my camera on the Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Adding a filter wheel to your imaging train increases the required backfocus beyond what the standard Alpy 600 provides. This Barlow lens provides the necessary additional spacing to bring your camera and filter wheel combination to focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the Alpy Barlow Lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is straightforward. The Barlow element is designed to be screwed directly onto the rear of the Alpy 600 unit, where you would normally attach your camera adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Barlow compatible with any other spectroscope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a dedicated optical component designed specifically for the Shelyak Alpy 600. It is not a general-purpose Barlow and is not intended for use with other instruments or for visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Barlow lens change the resolution of the Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAs a Barlow lens, it increases the effective focal length of the system. This will change the image scale on your sensor, but it is designed to work with the Alpy 600's native resolution and optical design to produce a usable spectrum with longer backfocus cameras.\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 colspan=\"2\" style=\"text-align:center;\"\u003eNo specifications provided.\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-full\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eNo items were listed in the box for this product.\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":52943047262493,"sku":"SHK-SE0128","price":205.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Barlow-lens-1_a57ee582-85e9-4edd-8090-b7ec863f89c6.jpg?v=1789616317"},{"product_id":"shelyak-se0129","title":"Shelyak C-mount adapter for the Alpy 600","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects C-mount cameras to the Shelyak Alpy 600\u003c\/li\u003e\n\u003cli\u003eProvides an adjustable backfocus range from 9.5mm to 20mm\u003c\/li\u003e\n\u003cli\u003eReplaces the standard T-mount thread on the spectroscope\u003c\/li\u003e\n\u003cli\u003eEnables use of common scientific and guiding cameras\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\u003eC-mount adapter for the Alpy 600\u003c\/h2\u003e\n\u003cp\u003eThis C-mount adapter for the Alpy 600 spectroscope allows you to set a precise camera backfocus between 9.5mm and 20mm. It replaces the native T-mount, opening up compatibility for C-mount cameras commonly used in spectroscopy that require a backfocus within this 9.5mm to 20mm range.\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\u003eC-Mount Compatibility and a 9.5mm to 20mm Backfocus Range\u003c\/h3\u003e\n\u003cp\u003eThe Shelyak Alpy 600 spectroscope is supplied with a standard T-mount for attaching a science camera. This adapter allows you to convert that interface to the C-mount standard, which is widely used by many compact, high-speed CMOS cameras ideal for spectroscopy.\u003c\/p\u003e\n\u003cp\u003eThe key feature is the adjustable backfocus, which can be set anywhere between 9.5mm and 20mm. This range gives you the flexibility to achieve a sharp focus with various camera models that have different sensor flange depths.\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\"\u003eWhy do I need this C-mount adapter for my Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Alpy 600 ships with a T-mount. This adapter is necessary if your science or guiding camera uses the C-mount standard, which is common for many high-frame-rate CMOS cameras. It physically converts the mount to ensure a secure, threaded connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 9.5mm to 20mm backfocus range on the Alpy 600 C-mount adapter mean?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is the range of distances you can set between the adapter's mounting flange and your camera's sensor to achieve a sharp focus on the spectroscope's slit. You will need to adjust within this range to match your specific camera's flange focal distance to get a sharp spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a guide camera with a 12.5mm backfocus. Can I use it with the Alpy 600 and this adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Since that camera's 12.5mm backfocus falls comfortably within the adapter's \u003cstrong\u003e9.5mm to 20mm adjustment range\u003c\/strong\u003e, you will be able to achieve proper focus. This makes it compatible with many popular C-mount cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter work for attaching my DSLR to the Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. DSLR cameras typically use T-mounts (via a T-ring) and have a much longer backfocus requirement (around 55mm), which is far outside this adapter's 9.5mm to 20mm range. The Alpy 600's standard T-mount is the correct interface for a DSLR.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a C-mount connection as secure as a T-mount for the Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for the cameras it's designed for. C-mount cameras are typically small and lightweight. The threaded C-mount connection provides a secure, non-flexing attachment essential for stable and repeatable spectroscopic work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set the correct backfocus with this Alpy 600 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will typically start by referencing your camera's documentation for its flange-to-sensor distance. Set the adapter within its 9.5mm to 20mm range to match that distance, then perform fine focusing adjustments on the telescope to get a sharp spectrum.\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\u003eCamera Mount\u003c\/td\u003e\n\u003ctd\u003eC-mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpectroscope Interface\u003c\/td\u003e\n\u003ctd\u003eReplaces Alpy 600 T-mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackfocus Range\u003c\/td\u003e\n\u003ctd\u003e9.5mm - 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Spectroscope\u003c\/td\u003e\n\u003ctd\u003eShelyak Alpy 600\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\"\u003eC-mount adapter for the Alpy 600\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_Alpy_600_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 Alpy 600 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":52943047590173,"sku":"SHK-SE0129","price":106.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-C-mount-adapter-for-the-Alpy-600-1_615451ca-76cd-4092-970c-608bf37473a2.jpg?v=1789616326"},{"product_id":"shelyak-se0131","title":"Shelyak Fiber Optic Adapter for Alpy 600","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects FC Standard Fiber Optics to the Alpy 600 Spectroscope\u003c\/li\u003e\n\u003cli\u003eReplaces the Standard 25µm Slit for Remote Light Injection\u003c\/li\u003e\n\u003cli\u003eEnables Bench-Mounted Setups and Remote Observatory Integration\u003c\/li\u003e\n\u003cli\u003eDesigned Specifically for the Shelyak Alpy 600\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\u003eFiber Optic Adapter for Alpy 600\u003c\/h2\u003e\n      \u003cp\u003eThis FC-standard fiber optic adapter replaces the standard slit on the Shelyak Alpy 600 spectroscope, enabling remote light acquisition for permanent observatory setups or controlled laboratory environments. While this adapter adds significant operational flexibility, it involves a direct trade-off: using a standard 50µm object fiber will result in lower spectral resolution than the Alpy 600's native 25µm slit.\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 50µm Fiber vs. the 25µm Slit\u003c\/h3\u003e\n      \u003cp\u003eThe primary function of this adapter is to couple your Alpy 600 to a fiber optic cable, allowing the spectroscope to be mounted on a stable bench away from the telescope. This isolates the instrument from vibration and temperature changes at the scope, but introduces a change in the optical path. A typical 50µm fiber optic core acts as a wider entrance aperture than the Alpy 600's standard 25µm slit, which reduces the instrument's resolving power. This is a critical consideration for users whose scientific goals demand the highest possible resolution; for applications where convenience and stability are paramount, the trade-off may be acceptable.\u003c\/p\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 use for the Alpy 600 Fiber Optic Adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter allows you to feed light into your Alpy 600 spectroscope via a fiber optic cable. This is ideal for \u003cstrong\u003eremote observatories\u003c\/strong\u003e where the telescope and spectroscope are physically separated, or for \u003cstrong\u003elaboratory work\u003c\/strong\u003e where the instrument is kept on a stable optical bench.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill using this adapter with the Alpy 600 affect my spectral resolution?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eYes, it will lower the resolution.\u003c\/strong\u003e The adapter is designed for standard 50µm optical fibers, which have a larger diameter than the Alpy 600's native 25µm slit. This wider entrance aperture reduces the spectroscope's resolving power. You gain remote capability at the cost of spectral detail.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I use the Fiber Optic Adapter for the Alpy 600 if it lowers resolution?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe main benefit is operational stability and convenience. By moving the Alpy 600 off the telescope and onto a stable bench, you can better control its temperature and isolate it from vibrations, which is crucial for long-term projects or precise calibration. This setup is common in permanently mounted observatory systems.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat type of fiber optic connector does this Alpy 600 adapter use?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe adapter uses the industry-standard \u003cstrong\u003eFC connector\u003c\/strong\u003e, a common type used in telecommunications and scientific instrumentation for its secure, threaded connection.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Alpy 600 adapter to study a star like Vega (Alpha Lyrae) from my remote setup?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. You would connect a fiber optic cable from your telescope's focal plane to this adapter on the Alpy 600. This allows you to acquire the spectrum of Vega while the spectroscope remains in a controlled indoor environment, isolated from the telescope's movement and outdoor conditions. Just be mindful of the inherent reduction in resolution when planning your observation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this adapter replace or add to the existing slit on the Alpy 600?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt \u003cstrong\u003ereplaces\u003c\/strong\u003e the standard slit module. You must remove the existing slit assembly from the Alpy 600 and install this fiber optic adapter in its place.\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\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Alpy 600 Spectroscope\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eFC Standard\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\"\u003eFiber Optic Adapter for Alpy 600\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\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_Alpy_600_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 Alpy 600 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\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":52943047917853,"sku":"SHK-SE0131","price":230.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Fiber-optic-adapter-for-Alpy-600-1_ac7f339d-5cf4-4066-ab5a-173860cec57c.jpg?v=1789616334"},{"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":305.0,"currency_code":"CAD","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"},{"product_id":"shelyak-se0150","title":"Shelyak Alpy \u0026 UVEX 35 µm slit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e35 µm Precision Slit Width\u003c\/li\u003e\n\u003cli\u003eIntegrated Guiding Mirror Surface\u003c\/li\u003e\n\u003cli\u003eCompatible with Shelyak Alpy \u0026amp; UVEX 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\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\u003eAlpy \u0026amp; UVEX 35 µm slit\u003c\/h2\u003e\n\u003cp\u003eThe Alpy \u0026amp; UVEX 35 µm slit is a core component for Shelyak spectrographs, functioning as both a precision entrance aperture and a guiding mirror. Its 35 µm width strikes a versatile balance between spectral resolution and light throughput, making it a standard choice for a wide range of astronomical 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 35µm Slit: Balancing Resolution and Light Throughput\u003c\/h3\u003e\n\u003cp\u003eIn spectroscopy, the slit width directly controls the trade-off between the detail in your spectrum and its brightness. The 35 µm slit for the Alpy and UVEX spectrographs is a popular choice because it represents a highly effective compromise for many observing conditions and targets.\u003c\/p\u003e\n\u003cp\u003eThe polished, reflective surface surrounding the slit allows you to view the entire star field through your guiding camera. This ensures you can keep your target perfectly centered on the nearly invisible slit for long exposures, maximizing signal and preventing drift.\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\u003eSlit Selection for Alpy \u0026amp; UVEX: The 35µm Slit vs. Other Options\u003c\/h3\u003e\n\u003cp\u003eChoosing the correct slit is fundamental to achieving your scientific goals. While the 35µm slit is an excellent all-rounder, understanding its context helps you make the right decision for your specific target.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Narrower Slits (e.g., 25 µm):\u003c\/strong\u003e A narrower slit yields higher spectral resolution but passes significantly less light. It is the superior choice for studying fine absorption lines in the spectra of bright stars, where signal is plentiful.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Wider Slits (e.g., 50 µm+):\u003c\/strong\u003e A wider slit captures more photons, which is critical for obtaining a usable signal on very faint objects like distant galaxies or low-surface-brightness nebulae. The trade-off is a lower-resolution spectrum where fine details may be blurred.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 35µm slit is the workhorse option, ideal for general stellar classification, analyzing emission lines in planetary nebulae, and capturing spectra of moderately bright comets and supernovae.\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 main purpose of the Alpy \u0026amp; UVEX 35 µm slit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt serves two critical functions. The precision-cut \u003cstrong\u003e35 µm slit\u003c\/strong\u003e acts as the entrance aperture for the spectrograph, determining the resolution of the spectrum. The reflective surface around the slit acts as a \u003cstrong\u003eguiding mirror\u003c\/strong\u003e, allowing you to see the star field and keep your target perfectly centered for the duration of an exposure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 35 µm slit affect the spectral resolution of my Alpy or UVEX?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe slit width is a primary factor in determining spectral resolution. A narrower slit produces a sharper, higher-resolution spectrum, allowing you to resolve finer details. The \u003cstrong\u003e35 µm slit\u003c\/strong\u003e provides a strong intermediate resolution, suitable for many projects from stellar classification to emission line studies in nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose the 35 µm slit over a narrower one for my Alpy\/UVEX?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou should choose the \u003cstrong\u003e35 µm slit\u003c\/strong\u003e when light throughput is as important as resolution. While a narrower slit (e.g., 25µm) offers higher resolution, it passes less light, requiring longer exposures. The 35µm slit is ideal for moderately faint targets or when seeing conditions don't support the highest possible resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Alpy \u0026amp; UVEX 35 µm slit for guiding on my target star?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The component is a guiding mirror with a slit at its center. The light from your target that doesn't pass through the slit is reflected into your guiding camera, allowing you to monitor the star's position and make precise tracking corrections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 35 µm slit a good choice for observing faint nebulae like the Orion Nebula (M42) with a Shelyak spectrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e35 µm slit\u003c\/strong\u003e is an excellent choice for targets like the Orion Nebula (M42). It allows enough light from the extended object to pass through to achieve a good signal-to-noise ratio in a reasonable time, while still providing enough resolution to separate key emission lines like Hydrogen-alpha and Oxygen-III.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eFor measuring the redshift of a bright quasar like 3C 273, would the 35 µm slit be appropriate for my UVEX?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e35 µm slit\u003c\/strong\u003e is a very capable option for a bright quasar like 3C 273. It provides a good balance, capturing enough light for a clear continuum while delivering the resolution needed to accurately measure the shift in prominent spectral lines, such as the broad Hydrogen-beta line used for redshift calculations.\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 Width\u003c\/td\u003e\n\u003ctd\u003e35 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Alpy and UVEX series spectrographs\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\"\u003eAlpy \u0026amp; UVEX 35 µm 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\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_Alpy_600_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 Alpy 600 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":52943049195805,"sku":"SHK-SE0150","price":305.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Alpy-UVEX-35-m-slit-1_b2bb2b2b-316f-4f80-84b8-877210aaf9ff.jpg?v=1789616376"},{"product_id":"shelyak-se0151","title":"Shelyak Alpy Guiding Mirror with 50 µm Slit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50 µm Slit Width\u003c\/li\u003e\n\u003cli\u003eIntegrated Guiding Mirror\u003c\/li\u003e\n\u003cli\u003eCompatible with Alpy Spectrograph Systems\u003c\/li\u003e\n\u003cli\u003eOptimized for Faint Object Spectroscopy\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\u003eShelyak Alpy Guiding Mirror with 50 µm Slit\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak Alpy Guiding Mirror with a 50 µm slit is a key component for the Alpy series of spectrographs, engineered to maximize light throughput from faint celestial targets. This specific slit width offers a practical balance, capturing more photons from diffuse objects like galaxies and nebulae compared to narrower slits, making it an essential choice for low-signal scientific work.\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 Dual-Function Alpy Guiding Mirror: A 50 µm Aperture\u003c\/h3\u003e\n\u003cp\u003eThis component serves a dual purpose critical to successful spectroscopy. The precision-cut 50 µm slit allows the focused starlight to pass through to the spectrograph's grating, while the highly reflective mirrored surface surrounding the slit directs the rest of the field of view to your guiding camera. This allows for precise, long-exposure guiding directly on your target, ensuring the star remains perfectly centered on the narrow slit for the duration of the observation.\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\u003e50 µm vs. 25 µm Slit: Trading Resolution for Throughput\u003c\/h3\u003e\n\u003cp\u003eChoosing a slit size is a fundamental compromise between spectral resolution and signal-to-noise ratio. The 50 µm slit is the preferred option when the primary goal is capturing a spectrum from a faint object, where every photon counts.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 µm Slit (This Product):\u003c\/strong\u003e Doubles the light-gathering area compared to a 25 µm slit, significantly improving the signal on faint galaxies, nebulae, or low-magnitude stars. This comes at the cost of lower spectral resolution, where fine spectral lines may appear broader.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e25 µm Slit:\u003c\/strong\u003e Offers higher spectral resolution, allowing for the separation of closely spaced spectral lines. This is ideal for studying bright stars with complex spectra but can make it challenging to acquire a usable signal from fainter targets.\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\"\u003eWhen should I choose the 50 µm slit for my Alpy spectrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou should choose the \u003cstrong\u003e50 µm slit\u003c\/strong\u003e when your primary targets are faint, diffuse objects. This includes galaxies, planetary nebulae, and low-magnitude variable stars. The wider aperture allows more light to enter the spectrograph, improving your signal-to-noise ratio at the expense of some spectral resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Alpy 50 µm slit affect the spectrum of a faint galaxy like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a target like M51, the \u003cstrong\u003e50 µm slit\u003c\/strong\u003e is highly advantageous. It will allow you to capture a usable signal from the galaxy's core in a much shorter time than a narrower slit. While you will lose some resolution, you will be able to clearly identify major features like H-alpha emissions and determine the galaxy's overall redshift.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I study the emission lines of a bright Be star like Gamma Cassiopeiae with the 50 µm slit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can absolutely use the \u003cstrong\u003e50 µm slit\u003c\/strong\u003e for a bright star like Gamma Cassiopeiae. You will easily capture the prominent Hydrogen-alpha emission line. However, for resolving very fine structures or subtle Doppler shifts in the line profile, a narrower slit like the 25 µm version would provide higher resolution and more detailed results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Alpy 50 µm slit over a 25 µm slit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main advantage is \u003cstrong\u003elight throughput\u003c\/strong\u003e. The 50 µm slit has a larger open area, allowing significantly more light to pass into the spectrograph. This is critical for reducing exposure times and achieving a better signal-to-noise ratio on faint objects, which might be impossible to record with a narrower slit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the guiding mirror on the 50 µm slit work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe component is a mirror with a tiny, central slit. Your telescope focuses the star field onto this mirror. The light from the target star goes through the \u003cstrong\u003e50 µm slit\u003c\/strong\u003e into the spectrograph. The surrounding stars in the field of view are reflected off the mirror's surface and into a separate guiding camera, allowing you to maintain perfect tracking for long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 50 µm slit compatible with all Shelyak Alpy models?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e50 µm slit\u003c\/strong\u003e is designed as a modular component for the Shelyak Alpy ecosystem. It is compatible with spectrograph models like the Alpy 600 and the Alpy 200 base module, allowing you to swap slits based on your observing goals for the night.\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 Width\u003c\/td\u003e\n\u003ctd\u003e50 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eGuiding Mirror Slit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak Alpy Spectrographs\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\"\u003e50 µm Guiding 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\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_Alpy_Guiding_Module_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 Alpy Guiding Module 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":52943049457949,"sku":"SHK-SE0151","price":305.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-50-m-slit-1_a440b1ee-2783-4775-bcef-a31672128820.jpg?v=1789616384"},{"product_id":"shelyak-se0275","title":"Shelyak Alpy 200 Optical Core Module","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts an Alpy 600 into an Alpy 200 Spectrograph\u003c\/li\u003e\n\u003cli\u003eResolving Power of R~130 with a 23µm slit\u003c\/li\u003e\n\u003cli\u003eFast F\/4 Aperture for high light throughput\u003c\/li\u003e\n\u003cli\u003eOptimized for spectroscopy of faint targets\u003c\/li\u003e\n\u003cli\u003eRequires existing Alpy 600 mechanical parts and slit\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\u003eAlpy 200 Optical Core Module\u003c\/h2\u003e\n\u003cp\u003eThe Alpy 200 optical core module transforms your existing Alpy 600 into a fast F\/4 spectrograph, delivering a resolving power of R~130 for analyzing the faintest targets. This module requires you to reuse the mechanical housing and a 23µm slit from your Alpy 600, providing a low-cost path to low-resolution spectroscopy.\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\u003eConvert Your Alpy 600 to an R~130 Spectrograph\u003c\/h3\u003e\n\u003cp\u003eThis module is designed specifically for astronomers who already own a Shelyak Alpy 600 spectrograph. By swapping the internal optics, you can repurpose your instrument for a different class of scientific work without purchasing an entirely new device. This is the optical heart of the Alpy 200, allowing you to achieve a resolving power of R~130.\u003c\/p\u003e\n\u003cp\u003ePlease note this is not a complete spectrograph. It is an upgrade component that relies on the mechanical chassis and the slit from your Alpy 600, which are not included with this module. The conversion allows you to switch between high-resolution and high-sensitivity setups as your observing targets change.\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\u003eAlpy 200 vs. Alpy 600: The F\/4 Advantage for Faint Targets\u003c\/h3\u003e\n\u003cp\u003eThe fundamental trade-off in spectroscopy is between resolution and sensitivity. While the Alpy 600 provides higher resolution for detailed analysis of brighter stars, the Alpy 200's fast F\/4 optical design is engineered to maximize photon collection on faint, extended objects. You sacrifice resolving power to gain critical signal-to-noise on challenging targets.\u003c\/p\u003e\n\u003cp\u003eThis makes the Alpy 200 configuration ideal for classifying supernovae, observing the spectral features of faint comets, or capturing data from low-surface-brightness nebulae. When every photon counts more than fine spectral detail, the R~130, F\/4 setup of the Alpy 200 is the superior choice.\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 Alpy 200 optical core module?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Alpy 200 optical core module is an upgrade component that converts an existing Shelyak Alpy 600 spectrograph into a low-resolution, high-sensitivity Alpy 200. Its fast \u003cstrong\u003eF\/4\u003c\/strong\u003e design and \u003cstrong\u003eR~130\u003c\/strong\u003e resolving power are optimized for capturing spectra from very faint astronomical objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to own an Alpy 600 to use the Alpy 200 core module?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This product is \u003cstrong\u003enot a standalone spectrograph\u003c\/strong\u003e. It is designed exclusively for owners of the Alpy 600, as it requires the reuse of the Alpy 600's mechanical body and slit assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat parts from my Alpy 600 are required for the Alpy 200 conversion?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need to use the complete mechanical housing of your Alpy 600 as well as the slit. The slit is a critical component that is not supplied with the Alpy 200 core module. The resolving power of R~130 is specified with a 23µm slit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Alpy 200 module perform when observing a faint supernova in a distant galaxy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is precisely the scenario where the Alpy 200 excels. For a faint supernova, collecting enough photons to get a usable signal is the main challenge. The fast \u003cstrong\u003eF\/4\u003c\/strong\u003e optics gather light efficiently, allowing you to obtain a low-resolution (\u003cstrong\u003eR~130\u003c\/strong\u003e) spectrum to classify the supernova type (e.g., Type Ia, Type II) and monitor its evolution, which would be difficult or impossible with a slower, higher-resolution spectrograph on the same telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose the Alpy 200 module's R~130 resolution over the Alpy 600's for a faint comet?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA faint comet's spectrum is characterized by broad emission bands from molecules like C2 and CN. High resolution is not needed to identify these features. The Alpy 200's low resolution and high throughput ensure you can capture a strong signal from the faint coma, making it a much more effective tool for cometary science than the higher-resolution Alpy 600 in this case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the F\/4 aperture of the Alpy 200 module mean for my observations?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003eF\/4\u003c\/strong\u003e aperture signifies a very \"fast\" optical system, meaning it concentrates light onto the sensor more intensely than a \"slower\" system (like an F\/8 or F\/10). This drastically reduces exposure times needed to achieve a good signal-to-noise ratio, which is essential for faint, diffuse targets that require every available photon.\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\u003eResolving Power\u003c\/td\u003e\n\u003ctd\u003eR ~130 with 23µm slit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003eF\/4\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\"\u003eAlpy 200 Optical Core Module\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_Alpy_600_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 Alpy 600 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Alpy_200_Core_Module_Assembly_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 Alpy 200 Core Module Assembly Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Alpy_Backfocus_Diagram.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 Alpy Backfocus Diagram\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Demetra_Software_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 Demetra Software 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":52943054700829,"sku":"SHK-SE0275","price":466.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Alpy-200-optical-core-module-1_a104d942-b8b9-405d-ab01-8e5a166f2d2e.jpg?v=1789616531"},{"product_id":"shelyak-se0276","title":"Shelyak Alpy 200 Switch Module","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts an Alpy 600 system for low-resolution spectroscopy\u003c\/li\u003e\n\u003cli\u003eResolving Power: R ~130 with a 23µm slit\u003c\/li\u003e\n\u003cli\u003eOptimized for F\/4 telescope systems\u003c\/li\u003e\n\u003cli\u003eTool-free installation with 6 knurled screws\u003c\/li\u003e\n\u003cli\u003eEnables spectral acquisition of very faint targets\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\u003eAlpy 200 Switch Module\u003c\/h2\u003e\n\u003cp\u003eThe Alpy 200 Switch Module lets you convert your existing Alpy 600 setup for low-resolution spectroscopy, achieving a resolving power of R ~130 with a 23µm slit. Designed for telescopes working at an F\/4 aperture, this module enables a rapid, tool-free swap to capture spectra from faint targets that are inaccessible to higher-resolution systems.\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\u003eFrom R~600 to R~130: A 2-Minute Spectrograph Swap\u003c\/h3\u003e\n\u003cp\u003eThis module is engineered for observers who already own the Alpy 600 guiding and spectrograph assembly. It allows you to quickly adapt your instrumentation to the target at hand, swapping from high to low resolution in a matter of minutes. The exchange is purely mechanical; simply undo the 6 knurled screws by hand, lift out the Alpy 600 module, and drop the Alpy 200 in its place.\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\u003eAlpy 200 vs. Alpy 600: Prioritizing Signal for Faint Targets\u003c\/h3\u003e\n\u003cp\u003eThe choice between the Alpy 600 and Alpy 200 is a direct trade-off between detail and depth. While the Alpy 600 provides higher resolution for detailed analysis of bright stars, the Alpy 200's R ~130 resolving power spreads the target's light over far fewer pixels. This concentration of photons is essential for successfully recording a signal from extremely faint objects like supernovae, distant quasars, and faint comets.\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\u003eCritical Workflow: Slit Selection and Recalibration for the F\/4 System\u003c\/h3\u003e\n\u003cp\u003eTo maintain data integrity, it's crucial to take new reference frames—specifically flats and calibration lamp spectra—after swapping modules. Note that this is the Alpy 200 module body only and is sold without a slit. You must order the appropriate slit for your telescope and camera configuration separately to complete the spectrograph.\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\"\u003eWhy would I use the Alpy 200 switch module instead of just my Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Alpy 200 module is for capturing spectra of very faint targets. Its low resolving power (R ~130) concentrates starlight, allowing you to get a usable signal on objects that would be too dim for the higher-resolution Alpy 600. It turns your existing system into a dual-purpose instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Alpy 200 switch module come with a slit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the Alpy 200 switch module is sold as the module body only. You must purchase a slit separately that matches your telescope and camera setup. This allows you to customize the instrument for your specific needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow long does it take to swap the Alpy 200 module into my Alpy 600 setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe swap is designed to be very fast, typically taking only a few minutes. The module is secured by 6 knurled screws that can be loosened and tightened by hand, requiring no tools for the exchange.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to capture the spectrum of a faint supernova with my C11 at F\/10. Is the Alpy 200 module the right choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. A faint supernova is a perfect target for the Alpy 200 module. Its low resolving power is specifically designed to maximize the signal-to-noise ratio on such faint point sources, where simply detecting and classifying the spectrum is the primary goal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Alpy 200 switch module on a fast F\/4 Newtonian to study cometary spectra?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Alpy 200 is optimized for an F\/4 aperture, making it an excellent match for fast Newtonian astrographs. This combination is ideal for studying the faint, diffuse spectra of comets, allowing you to capture the entire coma within the slit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate camera for the Alpy 200 switch module?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA separate camera is not required, as you can move your existing acquisition camera from the Alpy 600 to the Alpy 200 module. However, having a dedicated camera for each module makes the switch even faster and simpler, as you would not need to refocus the camera each time.\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\u003eResolving Power\u003c\/td\u003e\n\u003ctd\u003eR ~130 (with 23µm slit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNative Aperture\u003c\/td\u003e\n\u003ctd\u003eF\/4\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\"\u003eAlpy 200 Switch Module\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_Alpy_200_Core_Module_Assembly_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 Alpy 200 Core Module Assembly Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Alpy_600_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 Alpy 600 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Alpy_Backfocus_Diagram.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 Alpy Backfocus Diagram\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_Demetra_Software_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 Demetra Software 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":52943054897437,"sku":"SHK-SE0276","price":940.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Alpy-200-swich-module-1_cb9e328a-3b39-4e79-a4cf-6469cdbc84aa.jpg?v=1789616539"}],"url":"https:\/\/davidastro.com\/fr-us\/collections\/shelyak-alpy-spectroscopes.oembed","provider":"David Astro","version":"1.0","type":"link"}