{"title":"Guiding \u0026 Fiber Injection","description":null,"products":[{"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-op0024","title":"Shelyak Instruments 200µm Calibration Optical Fiber - 20m","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e20 meter length for flexible observatory layouts\u003c\/li\u003e\n\u003cli\u003e200µm core diameter optimized for calibration sources\u003c\/li\u003e\n\u003cli\u003eSecure FC-FC connectors for standard astronomical instruments\u003c\/li\u003e\n\u003cli\u003eNumerical Aperture of 0.22\u003c\/li\u003e\n\u003cli\u003eDurable stainless steel protective sheathing\u003c\/li\u003e\n\u003cli\u003eSignal attenuation less than 0.5dB\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\u003eShelyak Instruments 200µm Calibration Optical Fiber - 20m\u003c\/h2\u003e\n\u003cp\u003eThis Shelyak Instruments 20-meter optical fiber uses a 200µm core to deliver a stable, high-fidelity signal for calibrating fiber-fed Echelle spectrographs like the eShel or Whoppshel. The cable features industry-standard FC-FC connectors and a numerical aperture of 0.22, protected by a durable stainless steel sheath. With signal transmission close to 100% and total attenuation under 0.5dB, it ensures your calibration source light reaches the spectrograph with minimal loss, regardless of the 20-meter distance.\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\u003e200µm Core for High-Fidelity Spectrograph Calibration\u003c\/h3\u003e\n\u003cp\u003eThe 200µm core diameter is specifically sized to transmit light from a calibration unit to the spectrograph's fiber injection and guiding unit (FIGU). This diameter ensures a clean, uniform illumination of the spectrograph slit, which is essential for obtaining accurate and repeatable wavelength and flat-field calibrations. It is optimized for the controlled environment of a calibration lamp, not for collecting faint starlight.\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\u003eRobust 20-Meter Construction with FC-FC Connectors\u003c\/h3\u003e\n\u003cp\u003eA generous 20-meter length provides the flexibility to position your spectrograph and calibration unit anywhere in the observatory or lab without signal degradation. The fiber is protected by a stainless steel sheath, safeguarding it from crushing or kinking during setup and use. Standard FC-FC connectors provide a secure, repeatable physical connection to Shelyak instruments and other compatible hardware.\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\u003eNear-100% Transmission for eShel and Whoppshel Systems\u003c\/h3\u003e\n\u003cp\u003eThis fiber is engineered for minimal signal loss, with a transmission rate approaching 100% through the fiber itself. Total system attenuation is kept below 0.5dB, a figure that remains constant even at this 20-meter length. While the fiber is highly efficient, remember that the primary source of light loss occurs at the connectors; ensuring clean, secure junctions is key to maintaining a pure calibration signal for your eShel or Whoppshel system.\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 is the core diameter 200µm for this Shelyak calibration fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e200µm core diameter\u003c\/strong\u003e is specifically chosen to match the requirements of calibration units used with spectrographs like the Shelyak eShel. It provides a broad, even illumination of the spectrograph slit, which is critical for accurate flat-fielding and wavelength calibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 20-meter length of this fiber reduce my calibration signal strength?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The fiber itself has a transmission rate close to 100%, and the total attenuation is rated at \u003cstrong\u003eless than 0.5dB\u003c\/strong\u003e. This low level of loss is independent of the fiber's length up to 20 meters, so you will not see a noticeable drop in signal compared to a shorter fiber.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat systems is the Shelyak 200µm fiber compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis fiber is primarily designed for Shelyak Instruments' own fiber-fed spectrographs, such as the \u003cstrong\u003eeShel\u003c\/strong\u003e and \u003cstrong\u003eWhoppshel\u003c\/strong\u003e systems. It uses standard \u003cstrong\u003eFC-FC connectors\u003c\/strong\u003e, making it potentially compatible with other astronomical or laboratory equipment that uses the same interface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI am setting up an eShel spectrograph in my observatory. Is this 20-meter fiber the correct one for connecting the calibration unit to the FIGU?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the correct fiber for that purpose. The \u003cstrong\u003e200µm core\u003c\/strong\u003e is designed to carry the light from the calibration module to the Fiber Injection \u0026amp; Guiding Unit (FIGU) of the eShel. The 20-meter length offers ample flexibility for routing the cable between your telescope and the spectrograph.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are FC-FC connectors and why are they used on this calibration fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFC (Ferrule Connector) connectors are a type of fiber optic connector known for their secure, screw-on coupling mechanism. They provide excellent mechanical stability and repeatable alignment, which is critical in spectroscopy to prevent signal fluctuations. The \u003cstrong\u003eFC-FC\u003c\/strong\u003e designation means the cable has this type of connector on both ends.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy calibration lamp seems dim when using the 20-meter fiber with my Whoppshel system. Is the fiber causing the light loss?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is unlikely the fiber itself is the cause, as its attenuation is less than 0.5dB. The most common source of signal loss in a fiber optic system is at the connection points. Ensure both \u003cstrong\u003eFC-FC connectors\u003c\/strong\u003e are perfectly clean (free of dust) and securely tightened to minimize junction loss and maximize signal throughput.\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\u003eCore Diameter\u003c\/td\u003e\n\u003ctd\u003e200µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e20 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectors\u003c\/td\u003e\n\u003ctd\u003eFC-FC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumerical Aperture (NA)\u003c\/td\u003e\n\u003ctd\u003e0.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtective Sheath\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Attenuation\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.5dB (independent of length up to 20m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber Transmission\u003c\/td\u003e\n\u003ctd\u003eClose to 100%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Loss Source\u003c\/td\u003e\n\u003ctd\u003eJunctions at connector level\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\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":52943034384669,"sku":"SHK-OP0024","price":1009.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Calibration-optical-fiber-200-m-20m-1_30bcab48-6050-4176-97b9-b25001d0cf83.jpg?v=1789616021"},{"product_id":"shelyak-pf0008","title":"Shelyak FIGU F\/6 – 50µm Fiber Injection and Guiding Unit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eeShel Spectrograph Interface: Mounts at the telescope focus to feed starlight into the required optical fiber for Shelyak eShel and Whoppshel systems.\u003c\/li\u003e\n\u003cli\u003eIntegrated Guiding Port: Allows a user-supplied guide camera to view the field of view for precise target acquisition and on-axis guiding.\u003c\/li\u003e\n\u003cli\u003eSystem-Matched Design: Engineered to work with the specific focal ratios common to telescopes used for high-resolution spectroscopy.\u003c\/li\u003e\n\u003cli\u003eDual-Source Input: A remote-controlled mirror switches between the target starlight and an external calibration light source.\u003c\/li\u003e\n\u003cli\u003eDedicated Calibration Fiber Port: Accepts a secondary fiber from a calibration unit for acquiring essential reference frames.\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\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 FIGU F\/6 – 50µm Fiber Injection and Guiding Unit\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak FIGU (Fiber Injection and Guiding Unit) is the critical interface between your telescope and an eShel or Whoppshel spectrograph. It mounts at the telescope's focus to precisely inject starlight into the instrument's small-diameter optical fiber. This unit integrates on-axis guiding and remote source selection, forming the heart of your spectroscopic data acquisition system.\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\u003ePrecise Fiber Injection for Shelyak eShel Spectrographs\u003c\/h3\u003e\n\u003cp\u003eThis unit is engineered for specific telescope focal ratios to ensure optimal light coupling into the small-diameter optical fiber required by Shelyak echelle spectrographs. To achieve and maintain this critical alignment, the FIGU incorporates a port for a guiding camera (not included). This allows you to view the starfield directly, center your target perfectly on the fiber's microscopic entrance, and maintain accurate tracking throughout the exposure for maximum signal-to-noise ratio.\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\u003eRemote Mirror for Starlight and Calibration Switching\u003c\/h3\u003e\n\u003cp\u003eThe FIGU includes a remote-controlled internal mirror that enables instantaneous switching between two light sources. In one position, it directs starlight from the telescope into the science fiber. In the other, it accepts light from a calibration module via a separate, larger-diameter optical fiber. This function is essential for capturing reference spectra like flats or arcs without altering the telescope's position or the instrument setup.\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 Shelyak FIGU F\/6 – 50µm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary role is to act as an interface at the telescope's focus, precisely injecting the light from a star into the optical fiber of an eShel or Whoppshel spectrograph while also allowing for guiding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat else do I need to use the Shelyak FIGU?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need a compatible telescope with the correct focal ratio, a Shelyak eShel or Whoppshel spectrograph, a guiding camera, and a calibration module with its own optical fiber. These items are not included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Shelyak FIGU help with guiding on a target star like Deneb (Alpha Cygni)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe FIGU has a port for a guide camera that sees the area around the fiber entrance. You can place Deneb directly on the fiber, and then use the guide camera to keep it perfectly centered during long exposures, preventing signal loss from atmospheric turbulence or tracking errors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the remote-controlled mirror on the FIGU work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe internal mirror can be electronically flipped between two positions. One position directs the light from the telescope to the spectrograph's fiber. The other position blocks the starlight and instead directs light from a separate calibration fiber into the spectrograph, allowing you to take calibration frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Shelyak FIGU with any telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this FIGU model is specifically designed for telescopes operating at a particular focal ratio to ensure the light cone correctly matches the acceptance angle of the optical fiber. Using it with significantly faster or slower telescopes will result in inefficient light injection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is switching to a calibration source important for spectroscopy with the FIGU and an eShel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHigh-resolution spectroscopy requires calibration frames (like Thorium-Argon lamps) to accurately wavelength-calibrate the science data. The FIGU's remote switching lets you capture these calibration frames immediately before or after your science exposure without touching the setup, ensuring the highest possible accuracy.\u003c\/p\u003e\n\u003c\/div\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_eShel_Installation_and_Maintenance_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 eShel Installation and Maintenance 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":52943034843421,"sku":"SHK-PF0008","price":4959.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-FIGU-F-6-50-m-1_a71ab7fe-6e99-42cb-aa9d-6aa919ad831c.jpg?v=1789616037"},{"product_id":"shelyak-pf0018","title":"Shelyak FIGU F\/9 – 50µm Fiber Injection \u0026 Guiding Unit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eOptimized for F\/9 telescope optical systems\u003c\/li\u003e\n\u003cli\u003eInjects starlight into a 50µm core optical fiber\u003c\/li\u003e\n\u003cli\u003eIntegrated guiding port for precise target centering (camera not included)\u003c\/li\u003e\n\u003cli\u003eAccepts calibration light via a separate 200µm fiber\u003c\/li\u003e\n\u003cli\u003eRemote-controlled mirror for switching between star and calibration source\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\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 FIGU F\/9 – 50µm Fiber Injection \u0026amp; Guiding Unit\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak FIGU (Fiber Injection and Guiding Unit) F\/9 is engineered to mount at your telescope's focus, precisely channeling starlight from an F\/9 optical system into a 50µm fiber for analysis with an eShel or Whoppshel spectrograph. It features a remote-controlled mirror to instantly switch between your target star and a calibration module's 200µm fiber, ensuring seamless and accurate data acquisition for serious 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\u003ePrecision Fiber Injection for F\/9 Telescopes and 50µm Fibers\u003c\/h3\u003e\n\u003cp\u003eThe core function of the FIGU F\/9 is to solve the critical challenge of efficiently feeding a spectrograph. By matching the F\/9 light cone of your telescope to the 50µm core of the spectrograph's optical fiber, it maximizes light throughput and ensures your instrument receives the strongest possible signal, which is essential for capturing high-resolution spectra of faint targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated Guiding and Calibration via a 200µm Fiber Input\u003c\/h3\u003e\n\u003cp\u003eThis unit integrates two essential functions for successful spectroscopy. A port for a guiding camera (not included) allows you to view the telescope's field, locate your target, and guide directly on the star to keep it perfectly centered on the tiny 50µm fiber entrance. For calibration, a remote-controlled internal mirror flips to accept light from a 200µm fiber connected to your calibration module, letting you record reference spectra without altering your telescope's pointing.\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\u003eFIGU F\/9 vs. F\/6: Adapting for Slower Optical Systems\u003c\/h3\u003e\n\u003cp\u003eThis F\/9 model is a specialized variant of Shelyak's F\/6 FIGU, designed specifically for telescopes with slower focal ratios like Schmidt-Cassegrains or Maksutov-Cassegrains. It includes an integrated focal reducer that converts the telescope's F\/9 beam to the optimal input ratio for the spectrograph. This ensures that users of F\/9 systems achieve the same high efficiency and spectral resolution as those with faster telescopes, without needing external optical adapters.\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 FIGU F\/9?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Shelyak FIGU F\/9 is a specialized adapter that mounts at your telescope's focus. Its primary job is to take the light from a star captured by your \u003cstrong\u003eF\/9 telescope\u003c\/strong\u003e and inject it precisely into the \u003cstrong\u003e50µm optical fiber\u003c\/strong\u003e that feeds a spectrograph like the Shelyak eShel, enabling you to perform scientific spectral analysis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate guide camera for the FIGU F\/9?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a guiding camera is required but \u003cstrong\u003enot included\u003c\/strong\u003e. The FIGU F\/9 has a dedicated port for a guide camera, which is essential for viewing the starfield, accurately placing your target onto the fiber's entrance, and maintaining precise tracking during an exposure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I switch between my star and my calibration lamp with the FIGU F\/9?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe FIGU F\/9 contains a \u003cstrong\u003eremote-controlled mirror\u003c\/strong\u003e inside the unit. This allows you to electronically switch the input source from the telescope's starlight to the light from your calibration module (fed via a 200µm fiber) without physically touching or disturbing the telescope setup, ensuring repeatable and accurate calibrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need the F\/9 version of the FIGU instead of the F\/6 version for my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eStandard Schmidt-Cassegrain Telescopes (SCTs) typically operate around f\/10, very close to F\/9. The FIGU F\/9 includes a built-in focal reducer specifically to convert this slower light cone to the optimal angle for the spectrograph's fiber. Using the F\/6 version on an F\/9 telescope would result in significant light loss and inefficient performance. The F\/9 model is purpose-built for these systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat spectrographs is the FIGU F\/9 – 50µm designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis unit is designed as a core component for Shelyak's own spectroscopy systems. It is the standard fiber injection unit for the \u003cstrong\u003eeShel\u003c\/strong\u003e and \u003cstrong\u003eWhoppshel\u003c\/strong\u003e spectrographs when used with an F\/9 telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the FIGU F\/9 help me get an accurate spectrum of Vega (Alpha Lyrae) with my C8 at F\/9?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, you would use the guiding port on the FIGU F\/9 to view the starfield and precisely center Vega (Alpha Lyrae) on the 50µm fiber optic input. Once centered, you can begin your exposure. Before or after, you use the remote control to flip the internal mirror, allowing light from your calibration lamp to enter the spectrograph. This provides a reference spectrum, which is critical for accurately calibrating the wavelength of the data you captured from Vega.\u003c\/p\u003e\n\u003c\/div\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":52943036219677,"sku":"SHK-PF0018","price":6168.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-FIGU-F-9-50-m-1_0bbbc0c1-6cdd-4d37-9342-0f8e6a2df26e.jpg?v=1789616062"},{"product_id":"shelyak-pf0019","title":"Shelyak Calibration Optical Fiber - 200µm, 10m","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Diameter:\u003c\/strong\u003e 200µm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 10 meters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectors:\u003c\/strong\u003e FC-FC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumerical Aperture:\u003c\/strong\u003e 0.22\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e Stainless Steel Sheath\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAttenuation:\u003c\/strong\u003e \u0026lt;0.5dB\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 Calibration Optical Fiber - 200µm, 10m\u003c\/h2\u003e\n\u003cp\u003eThis 10m Shelyak calibration fiber uses a 200µm core diameter, the standard for delivering a clean calibration signal in fiber-fed Echelle systems like the eShel and Whoppshel. With a numerical aperture of 0.22 and rugged stainless steel protection, it ensures a stable and robust connection from your calibration module to the spectrograph's FIGU. Its design guarantees near 100% transmission along the fiber itself, with total attenuation kept below 0.5dB—a figure that remains consistent even for longer 20m versions.\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\u003eHigh-Fidelity Signal Path: The 200µm Core for eShel Systems\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for astronomical spectroscopy, this fiber's 200µm core provides an optimal light path from a calibration lamp to the spectrograph. The industry-standard FC-FC connectors ensure a secure, threaded coupling that minimizes signal loss at the junction points. The entire length is protected by a flexible stainless steel sheath, safeguarding the delicate fiber from being crushed or kinked in an active observatory environment.\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\u003eConsistent Signal Strength: \u0026lt;0.5dB Attenuation Across All Lengths\u003c\/h3\u003e\n\u003cp\u003eA key characteristic of this fiber is that signal loss is dominated by the connectors, not the length of the cable. Transmission through the fiber itself is close to 100%, resulting in total attenuation of less than 0.5dB. This means you can run this 10m cable, or even a longer 20m version, without any practical degradation in your calibration lamp's signal intensity, giving you greater flexibility in positioning your equipment.\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 use for the Shelyak 200µm calibration fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis fiber is designed to conduct light from a calibration module (like a Thorium-Argon or Tungsten lamp) to the Fiber Injection \u0026amp; Guiding Unit (FIGU) of a spectroscope. It is specifically optimized for Shelyak's own eShel and Whoppshel Echelle spectroscopy systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I place my eShel calibration unit 15 meters away, will a longer fiber have more signal loss than this 10m fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, you should not see any practical difference in signal strength. The manufacturer specifies that attenuation is less than 0.5dB regardless of length (up to 20m). This is because the minimal signal loss occurs at the FC-FC connector junctions, not along the highly transmissive fiber itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the core diameter of this Shelyak fiber 200µm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e200µm core diameter\u003c\/strong\u003e is matched to the optical design of spectrographs like the eShel. This ensures the maximum amount of light from the calibration lamp is efficiently captured and injected into the spectrograph for accurate wavelength calibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a Whoppshel spectrograph. Is this 10m calibration fiber the correct one to use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This 200µm calibration fiber is explicitly designed and optimized for use with both the Shelyak eShel and Whoppshel spectroscopy systems, ensuring full compatibility and reliable operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are FC-FC connectors on this 200µm fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eFC connectors\u003c\/strong\u003e are a standard for high-quality optical fibers. They provide a secure, threaded connection that ensures precise alignment of the fiber cores, which minimizes signal loss and prevents accidental disconnection during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the stainless steel protection on the Shelyak calibration fiber do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe stainless steel sheath acts as a durable armor for the delicate glass fiber inside. It protects the fiber from being crushed by equipment, kinked from tight bends, or otherwise damaged, ensuring the long-term reliability and signal integrity of your calibration setup.\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\u003eCore Diameter\u003c\/td\u003e\n\u003ctd\u003e200µm (for calibration fibers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Lengths\u003c\/td\u003e\n\u003ctd\u003e10 or 20 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eStainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eFC-FC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumerical Aperture (NA)\u003c\/td\u003e\n\u003ctd\u003e0.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAttenuation\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.5dB (valid for 5, 10, or 20m lengths)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Note\u003c\/td\u003e\n\u003ctd\u003eLosses mainly occur at connector junctions. The transmission of the fiber itself is close to 100% over these lengths.\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\"\u003eCalibration Optical Fiber (200µm, 10m)\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":52943036875037,"sku":"SHK-PF0019","price":731.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Calibration-optical-fiber-200-m-20m-1_e6df1f51-e1ad-47b3-934d-72af6006da21.jpg?v=1789616069"},{"product_id":"shelyak-pf0049","title":"Shelyak 50µm Object Fiber - 5m","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50µm Core Diameter Object Fiber\u003c\/li\u003e\n\u003cli\u003e5m Cable Length\u003c\/li\u003e\n\u003cli\u003eFC Type Connectors (Both Ends)\u003c\/li\u003e\n\u003cli\u003e380nm - 800nm+ Wavelength Range\u003c\/li\u003e\n\u003cli\u003eNumerical Aperture: 0.22\u003c\/li\u003e\n\u003cli\u003eLess than 0.5dB Attenuation\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\u003e50µm Object Fiber - 5m\u003c\/h2\u003e\n\u003cp\u003eThis 5m Shelyak object fiber features a 50µm core optimized for high-resolution spectroscopy from 380nm to 800nm and beyond. With a numerical aperture of 0.22 and industry-standard FC connectors, it ensures efficient light injection from your telescope's FIGU to an eShel spectroscope while maintaining signal integrity with less than 0.5dB of attenuation.\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\u003eHigh-OH 50µm Core for 380-800nm Spectroscopy\u003c\/h3\u003e\n\u003cp\u003eThis fiber uses \"High-OH\" material, which provides excellent transmission in the blue part of the spectrum, making it ideal for UV-VIS spectroscopy across its full 380nm to 800nm+ operational range. The 50µm core diameter is the standard for the \"Object\" fiber in Shelyak's eShel system, precisely carrying the starlight from the telescope to the spectrograph for analysis. Signal loss is kept below 0.5dB, as attenuation primarily occurs at the connectors, not along the fiber's length.\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\u003eFC Connectors and 0.22 NA for eShel System Integration\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for systems like the eShel, this fiber is terminated with robust FC-type connectors on both ends for a secure and repeatable connection between your Fiber Injection and Guiding Unit (FIGU) and the spectroscope. The 0.22 numerical aperture (NA) is matched to astronomical instrumentation to ensure efficient light coupling from the telescope's focal plane into the fiber core, maximizing throughput for faint targets.\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 50µm object fiber in an eShel system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is the primary \"Object\" fiber, designed to transmit the starlight collected by your telescope to the spectroscope. It physically connects the Fiber Injection and Guiding Unit (FIGU) at the telescope to the eShel spectrograph, which may be located several meters away.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this 50µm fiber described as \"High-OH\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-OH\u003c\/strong\u003e refers to the fiber's material composition, which offers superior transmission in the blue and ultraviolet parts of the spectrum. This makes the fiber highly effective for spectroscopy in the \u003cstrong\u003e380nm to 800nm\u003c\/strong\u003e range, capturing critical spectral lines that might be attenuated by standard fibers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 5m length of this 50µm fiber cause more signal loss than a shorter one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the signal loss will be virtually identical. The specified attenuation of \u003cstrong\u003e\u0026lt;0.5dB\u003c\/strong\u003e is dominated by losses at the FC connector junctions, not by the length of the fiber itself. Transmission through the fiber is near 100%, so 5m, 10m, or 20m versions of this fiber will have comparable performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 50µm fiber to study the Balmer series in Vega (Alpha Lyrae)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Vega's prominent hydrogen Balmer absorption lines (like H-beta at 486nm and H-gamma at 434nm) fall squarely within the optimal \u003cstrong\u003e380nm to 800nm\u003c\/strong\u003e range of this High-OH fiber. It will efficiently transmit the light needed to capture a high-quality spectrum of these features with an eShel system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 50µm core diameter of this object fiber affect my spectral resolution with an eShel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e50µm core diameter\u003c\/strong\u003e acts as the entrance slit for the spectrograph in a fiber-fed system like the eShel. This diameter is a key factor in determining the ultimate resolving power of the instrument. The eShel is designed around this specific fiber diameter to achieve its high-resolution capabilities, so using this fiber is critical for obtaining the expected performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are FC connectors and why are they used on this Shelyak 50µm fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFC connectors are a type of fiber optic connector known for their secure, screw-on coupling mechanism. They are used in scientific and telecommunications applications where a stable, vibration-resistant connection is critical to prevent signal loss or disconnection, which is essential for long-exposure astronomical spectroscopy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003e50µm Object Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e5m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Diameter\u003c\/td\u003e\n\u003ctd\u003e50µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectors\u003c\/td\u003e\n\u003ctd\u003eFC type (both ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumerical Aperture (NA)\u003c\/td\u003e\n\u003ctd\u003e0.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber Type\u003c\/td\u003e\n\u003ctd\u003eHigh-OH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e380nm to 800nm+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAttenuation\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.5dB\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\"\u003e50µm Object Fiber (5m)\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_eShel_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 eShel 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":52943039201565,"sku":"SHK-PF0049","price":313.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-50-m-object-fiber-5m-1_badbcc0c-6a97-4719-8759-baab1be1ef34.jpg?v=1789616102"},{"product_id":"shelyak-pf0050","title":"Shelyak 50µm Object Fiber - 10m","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e10m Fiber Length\u003c\/li\u003e\n\u003cli\u003e50µm Core Diameter\u003c\/li\u003e\n\u003cli\u003eHigh-OH Fiber for UV-VIS Transmission (380-800nm)\u003c\/li\u003e\n\u003cli\u003eFC-type Connectors (Both Ends)\u003c\/li\u003e\n\u003cli\u003e\u0026lt;0.5dB Signal Attenuation\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 50µm Object Fiber - 10m\u003c\/h2\u003e\n\u003cp\u003eThis Shelyak 10m object fiber uses a 50µm core and High-OH glass to ensure maximum signal transmission from 380nm to over 800nm for high-resolution spectroscopy. Signal loss is kept below 0.5dB, as attenuation occurs almost exclusively at the FC-type connectors, while the fiber itself maintains nearly 100% transmission. The numerical aperture of 0.22 is optimized for coupling starlight from a telescope's focal plane into an eShel spectroscope.\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\u003eHigh-OH Fiber for UV-VIS Spectroscopy: 380-800nm Range\u003c\/h3\u003e\n\u003cp\u003eThis is not a generic telecommunications fiber. Shelyak uses a specific \"High-OH\" fiber with a 50µm core, which provides superior transmission in the blue and ultraviolet portions of the spectrum. This allows you to capture critical spectral features across a wide 380nm to 800nm+ band, from the Calcium H \u0026amp; K lines in the violet to the Hydrogen-alpha line in the deep red.\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\u003eMinimal Signal Loss: \u0026lt;0.5dB Attenuation over 10m\u003c\/h3\u003e\n\u003cp\u003eWhen working with faint stellar signals, every photon counts. The fiber itself has a transmission rate close to 100%, meaning the 10m length does not degrade the signal. The only meaningful loss, rated at less than 0.5dB, occurs at the FC-type connector junctions, ensuring your data's integrity between the telescope and the spectroscope.\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 is this Shelyak 50µm fiber called an \"Object\" fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a fiber-fed spectroscope system like the Shelyak eShel, two fibers are used. The \u003cstrong\u003e50µm \"Object\" fiber\u003c\/strong\u003e carries the starlight from the telescope to the spectroscope. A second, larger fiber is often used for calibration, carrying light from a calibration lamp. This fiber is specifically designed for the primary starlight signal path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of a \"High-OH\" fiber for my spectroscopy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eHigh-OH (high hydroxyl)\u003c\/strong\u003e fiber has excellent transmission characteristics in the ultraviolet and blue parts of the spectrum, down to 380nm. This is critical for astrophysical studies, such as analyzing the Balmer series lines in A-type stars or the prominent Calcium H and K lines, which are found in the violet end of the spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I lose significant signal with this 10m Shelyak fiber compared to a shorter one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The fiber material itself has a transmission close to 100%, regardless of length up to several dozen meters. The signal attenuation of \u003cstrong\u003e\u0026lt;0.5dB\u003c\/strong\u003e is almost entirely from coupling losses at the connectors. A 5m, 10m, or 20m Shelyak fiber will deliver virtually identical signal strength to your spectroscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this 50µm fiber suitable for capturing the full spectrum of Vega (Alpha Lyrae)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. Vega is an A-type star with very prominent hydrogen absorption lines (the Balmer series) across the visible spectrum. The \u003cstrong\u003e380-800nm\u003c\/strong\u003e range of this High-OH fiber is ideal for capturing everything from the H-beta line (486nm) in the blue-green to H-alpha (656nm) in the red, making it perfect for studying such stars with an eShel system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Shelyak fiber to analyze emission nebulae like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The excellent transmission of this fiber makes it well-suited for analyzing the distinct emission lines of nebulae. Key lines for objects like the Orion Nebula (M42) are well within its range, including Hydrogen-alpha (656nm), Hydrogen-beta (486nm), and the two Oxygen-III lines (496nm and 501nm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the NA=0.22 numerical aperture mean for my eShel setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eNumerical Aperture (NA) of 0.22\u003c\/strong\u003e defines the acceptance cone of light the fiber can efficiently capture. It's designed to match the focal ratio of the telescope beam as it enters the Fiber Injection and Guiding Unit (FIGU). This ensures that the starlight is coupled into the 50µm fiber core with minimal loss, maximizing the signal sent to the spectroscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eObject Fiber for Spectroscopy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e10 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Diameter\u003c\/td\u003e\n\u003ctd\u003e50µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectors\u003c\/td\u003e\n\u003ctd\u003eFC type (both ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumerical Aperture (NA)\u003c\/td\u003e\n\u003ctd\u003e0.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber Type\u003c\/td\u003e\n\u003ctd\u003eHigh-OH (Optimized for UV-VIS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e380nm - 800nm+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Attenuation\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.5dB (at connectors)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber Transmission\u003c\/td\u003e\n\u003ctd\u003eApproximately 100%\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\"\u003e50µm Object Fiber with FC Connectors\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":52943039496477,"sku":"SHK-PF0050","price":479.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-50-m-object-fiber-5m-1_8ffffce0-3b68-41be-b4e8-23f9706a67ad.jpg?v=1789616110"},{"product_id":"shelyak-pf0051","title":"Shelyak 50µm Object Fiber - 20m","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50µm Core Diameter\u003c\/li\u003e\n\u003cli\u003e20 Meter Length\u003c\/li\u003e\n\u003cli\u003eLess than 0.5dB Attenuation\u003c\/li\u003e\n\u003cli\u003e380-800nm Spectral Range\u003c\/li\u003e\n\u003cli\u003eFC-Type Connectors (Both Ends)\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 50µm Object Fiber - 20m\u003c\/h2\u003e\n\u003cp\u003eThis 20-meter Shelyak object fiber uses a 50µm core to transmit starlight from your telescope's Fiber Injection and Guiding Unit (FIGU) directly to a compatible spectroscope like the eShel. Its High-OH fiber construction is optimized for the 380 to 800nm spectral range, while the 0.22 numerical aperture efficiently couples light into the system with less than 0.5dB of total attenuation.\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\u003eA 50µm Core for High-Resolution eShel Spectroscopy\u003c\/h3\u003e\n\u003cp\u003eEngineered as the primary light path for Shelyak's eShel system, this fiber's 50µm core diameter is precisely matched to the instrument's design for optimal resolution. The 20-meter length provides ample flexibility for permanent observatory setups where the telescope and spectroscope may be positioned far apart. Both ends are terminated with robust FC-type connectors for a secure, repeatable connection between the FIGU and the spectrograph.\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\u003eHigh-OH Fiber: \u0026lt;0.5dB Attenuation from 380-800nm\u003c\/h3\u003e\n\u003cp\u003eThis fiber uses \"High-OH\" glass, which enhances transmission in the blue and ultraviolet portions of the spectrum, making it effective from 380nm to 800nm and beyond. The total signal loss is rated at less than 0.5dB, a figure dominated by the connection points rather than the fiber itself. This means transmission is near 100% along the 20-meter length, ensuring that valuable photons from your target reach the sensor.\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 50µm object fiber in an eShel system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is the \"object\" fiber, designed to carry the starlight collected by the telescope to the spectroscope. It physically connects the Fiber Injection and Guiding Unit (FIGU) at the telescope to the main eShel instrument, which can be located up to 20 meters away.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the attenuation of the 20m fiber rated at \u0026lt;0.5dB, the same as shorter fibers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor modern optical fibers of this length, signal loss along the glass itself is negligible (close to 100% transmission). The vast majority of the \u0026lt;0.5dB attenuation occurs at the two FC connector junctions. Because the number of connections is the same regardless of length, the total attenuation remains constant across 5m, 10m, and 20m versions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 50µm object fiber to study the Balmer series in Vega (Alpha Lyrae) with an eShel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The fiber's High-OH glass provides excellent transmission from 380nm to 800nm. This range comfortably covers the entire visible Balmer series of hydrogen, from H-alpha (656nm) down to H-beta (486nm), H-gamma (434nm), and H-delta (410nm), making it ideal for stellar classification of A-type stars like Vega.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"High-OH\" mean for this 50µm fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003e\"High-OH\"\u003c\/strong\u003e refers to a high concentration of hydroxyl groups in the silica glass, which significantly improves the fiber's transparency to blue and ultraviolet (UV) light. This makes the fiber highly efficient for spectroscopy in the 380nm to 800nm range, ensuring faint signals in the blue end of the spectrum are not lost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have my telescope and eShel spectroscope set up 15 meters apart. Is the 20m fiber the right choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 20-meter length is the correct choice. It provides the necessary distance with extra slack to prevent strain on the fiber or connectors as the telescope moves. Since attenuation is independent of length in this range, there is no performance penalty for choosing the 20m version over a shorter one.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of connectors does the Shelyak 50µm object fiber use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe fiber is terminated with \u003cstrong\u003eFC-type connectors\u003c\/strong\u003e on both ends. This is a standard, robust connector used in spectroscopy and telecommunications to ensure precise and repeatable alignment of the fiber core.\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\u003eCore Diameter\u003c\/td\u003e\n\u003ctd\u003e50µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e20 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectors\u003c\/td\u003e\n\u003ctd\u003eFC type (both ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumerical Aperture\u003c\/td\u003e\n\u003ctd\u003e0.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAttenuation\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.5dB (independent of length)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber Type\u003c\/td\u003e\n\u003ctd\u003eHigh-OH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable Spectral Range\u003c\/td\u003e\n\u003ctd\u003e380nm - 800nm+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber Transmission\u003c\/td\u003e\n\u003ctd\u003eApproximately 100% over this length\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\"\u003e50µm Object Fiber - 20m\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_eShel_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 eShel 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":52943039758621,"sku":"SHK-PF0051","price":705.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-50-m-object-fiber-5m-1_62cf15ba-34a3-4301-995e-ec23a3494a3b.jpg?v=1789616118"},{"product_id":"shelyak-se0135","title":"Shelyak Eyepiece Holder for Guiding","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables direct visual guiding for spectrographs\u003c\/li\u003e\n\u003cli\u003eAccepts standard 1.25\" eyepieces\u003c\/li\u003e\n\u003cli\u003eReplaces the need for a dedicated guide camera and software\u003c\/li\u003e\n\u003cli\u003eDesigned for the Alpy 600 and UVEX guiding modules\u003c\/li\u003e\n\u003cli\u003eIdeal for educational settings and short exposures on bright stars\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\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 Eyepiece Holder for Guiding\u003c\/h2\u003e\n\u003cp\u003eThe Shelyak Eyepiece Holder for Guiding provides a direct, visual alternative to electronic autoguiding for Alpy 600 and UVEX spectrographs. It accepts a standard 1.25\" eyepiece, allowing you to manually guide on bright targets without the complexity of managing a second camera. This accessory is designed specifically to integrate with the Shelyak guiding module, simplifying spectroscopic sessions for educational outreach and practical astronomy.\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\u003eSimplify Your Setup: From Guide Camera to 1.25\" Eyepiece\u003c\/h3\u003e\n\u003cp\u003eFor many spectroscopic applications, particularly in educational or outreach settings, the complexity of running a second camera for guiding can be a significant hurdle. This holder replaces the guide camera on the Alpy or UVEX guiding module, eliminating the need for extra cables, power, and control software. You simply insert a 1.25\" reticle eyepiece and guide by eye, keeping your focus on the science target and the spectrograph itself.\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\u003eA Solution for Education and Bright Targets\u003c\/h3\u003e\n\u003cp\u003eThis accessory was developed based on requests from university educators who needed a simpler way to conduct practical sessions with students. When managing a primary science camera and spectrograph, adding an autoguider introduces another layer of potential issues. By enabling visual guiding, this holder makes it feasible to perform spectroscopy on bright stars, where exposure times are short and the precision of an autoguider is not strictly necessary.\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\u003eVisual vs. Autoguiding: Understanding the Trade-Off\u003c\/h3\u003e\n\u003cp\u003eWhile a dedicated guiding camera offers superior efficiency and precision for long exposures on faint objects, it is not always the required tool for the job. This eyepiece holder is a relevant and practical solution when simplicity outweighs the need for automated accuracy. It allows for quick setup and immediate visual confirmation on the guide star, making it a highly effective tool for its intended purpose of simplifying short-exposure and educational spectroscopy.\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 Eyepiece Holder for Guiding?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis holder is designed to replace a guide camera on a Shelyak Alpy 600 or UVEX guiding module. It allows you to insert a standard \u003cstrong\u003e1.25\" eyepiece\u003c\/strong\u003e and guide your telescope visually, which simplifies the setup by removing the need for a second camera, computer connection, and guiding software.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Eyepiece Holder directly on my Alpy 600 spectrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This accessory is \u003cstrong\u003eonly compatible with the Shelyak guiding module\u003c\/strong\u003e for the Alpy 600 and UVEX spectrographs. It cannot be attached directly to the spectrograph itself; it must be installed on the guiding module in place of the guide camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWould the Eyepiece Holder be a good choice for a student project on Vega (Alpha Lyrae) with an Alpy 600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal scenario. Vega is an extremely bright star, so exposure times will be very short. Using the Eyepiece Holder allows a student to easily keep the star centered visually, simplifying the data acquisition process and avoiding the complexities of setting up an autoguiding camera for a target that doesn't require it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose this Eyepiece Holder over a dedicated autoguiding camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would choose this holder for \u003cstrong\u003esimplicity and speed\u003c\/strong\u003e. It's perfect for educational settings, public outreach, or any situation involving short exposures on bright targets where the setup time and complexity of an autoguider are unnecessary. For long exposures on faint targets, a dedicated autoguiding camera remains the more efficient solution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm demonstrating spectroscopy with an 8\" SCT at a public outreach event. Is this holder suitable?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An outreach event is a perfect use case. It allows you to quickly acquire a bright star, keep it centered by eye using a reticle eyepiece, and focus on explaining the spectrum to the public without being tethered to a laptop running guiding software. It makes for a much more streamlined and reliable demonstration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size eyepiece does the Shelyak Eyepiece Holder accept?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe holder is designed to accept standard \u003cstrong\u003e1.25\" eyepieces\u003c\/strong\u003e. A crosshair or reticle eyepiece is recommended for precise visual guiding.\u003c\/p\u003e\n\u003c\/div\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":52943048409373,"sku":"SHK-SE0135","price":496.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Eyepiece-holder-for-guiding-1_9e2ffffd-7912-466d-bd15-540301162424.jpg?v=1789616351"},{"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-se0238","title":"Shelyak Fiber Optic Connector Kit for UVEX","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdapts the Shelyak UVEX spectrograph for fiber optic input\u003c\/li\u003e\n\u003cli\u003eEnables physical separation of the telescope and spectrograph\u003c\/li\u003e\n\u003cli\u003eIdeal for permanent observatory installations to reduce vibration and thermal influence\u003c\/li\u003e\n\u003cli\u003eFacilitates a stable and repeatable setup for long-term projects\u003c\/li\u003e\n\u003cli\u003eEngineered for a trade-off between light throughput and spectral resolution\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 Connector Kit for UVEX\u003c\/h2\u003e\n\u003cp\u003eThis Fiber Optic Connector Kit adapts the Shelyak UVEX spectrograph for use with a fiber optic feed, allowing you to physically decouple the instrument from your telescope. This capability is essential for permanent observatory setups where the spectrograph can be mounted on a stable pier or bench, isolated from telescope vibrations and thermal variations. By feeding light directly from the telescope's focal plane via an optical fiber, you gain significant stability for long-term scientific projects, such as exoplanet transit monitoring or variable star photometry.\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\u003eRemote Light Injection for the UVEX Spectrograph\u003c\/h3\u003e\n\u003cp\u003eThe primary function of this kit is to enable remote spectroscopy. Instead of mounting the heavy and sensitive UVEX directly onto your moving telescope, this adapter allows you to place it in a controlled environment. This minimizes mechanical flexure, focus drift due to temperature changes, and vibrations, which are critical sources of error in high-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\u003eUnderstanding the Resolution Trade-Off\u003c\/h3\u003e\n\u003cp\u003eUsing an optical fiber feed involves a deliberate engineering trade-off. A typical optical fiber has a larger diameter than the UVEX's standard entrance slit. This increases light throughput, which is beneficial for faint targets, but it also reduces the instrument's ultimate spectral resolution. This kit is therefore optimized for applications where stability and light-gathering are more critical than achieving the highest possible resolution the UVEX can offer with its narrowest slit.\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 UVEX Fiber Optic Connector Kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of this kit is to allow you to connect a fiber optic cable to your Shelyak UVEX spectrograph. This enables you to physically separate the spectrograph from the telescope, which is ideal for permanent observatory setups to improve stability and reduce environmental interference like vibration and temperature changes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does using this fiber optic kit affect the resolution of my UVEX spectrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUsing an optical fiber reduces the spectrograph's resolution compared to using its standard, narrower slit. The larger core of a typical fiber acts as a wider entrance slit, increasing light throughput for fainter targets but resulting in broader spectral lines. This is a known trade-off for gaining the stability of a fiber-fed system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I use a fiber optic feed with my UVEX for a project on a star like Betelgeuse (Alpha Orionis)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor long-term monitoring of a variable star like Betelgeuse, stability is paramount. A fiber feed isolates the UVEX spectrograph from the telescope's movement and thermal shifts, ensuring that any changes you record in the star's spectrum are genuine and not artifacts from the equipment. This stable, repeatable setup is crucial for differential photometry and radial velocity studies over weeks or months.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this kit to build a remote-controlled spectroscopy setup in my observatory?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this kit is a key component for such a setup. By placing the UVEX on a stable bench and running a fiber optic cable to the telescope, you can automate your data acquisition without having to physically interact with the spectrograph, minimizing disturbances and allowing for fully remote operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Fiber Optic Connector Kit for UVEX include the fiber optic cable itself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this kit is an adapter to connect a fiber to the spectrograph. The optical fiber cable itself is sold separately, allowing you to choose the appropriate length and core diameter for your specific observatory configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this connector kit compatible with other spectrographs, like the Lhires III?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis kit is specifically designed for the Shelyak UVEX spectrograph. It is not compatible with other models like the Lhires III, which have different mechanical interfaces and optical designs.\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\u003eSpecifications\u003c\/td\u003e\n\u003ctd\u003eNo specifications available for this accessory.\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\"\u003ePackage contents not specified.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak_UVEX_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eShelyak UVEX Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/shelyak-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eShelyak 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":52943051686173,"sku":"SHK-SE0238","price":305.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Fiber-optic-connector-kit-for-UVEX-1_864bbaf8-6b09-4703-aeb1-1f99092dd2dd.jpg?v=1789616451"}],"url":"https:\/\/davidastro.com\/fr\/collections\/spectro-guiding-and-fibers.oembed","provider":"David Astro","version":"1.0","type":"link"}