{"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":347.0,"currency_code":"USD","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","url":"https:\/\/davidastro.com\/en-us\/products\/shelyak-pf0050","provider":"David Astro","version":"1.0","type":"link"}