{"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","url":"https:\/\/davidastro.com\/products\/shelyak-pf0018","provider":"David Astro","version":"1.0","type":"link"}