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Shelyak FIGU F/9 – 50µm Fiber Injection & Guiding Unit

Shelyak FIGU F/9 – 50µm Fiber Injection & Guiding Unit

by Shelyak
SKU SHK-PF0018
CA$6,168.00 - CA$6,168.00
CA$6,168.00
CA$6,168.00 - CA$6,168.00
CA$6,168.00
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  • Optimized for F/9 telescope optical systems
  • Injects starlight into a 50µm core optical fiber
  • Integrated guiding port for precise target centering (camera not included)
  • Accepts calibration light via a separate 200µm fiber
  • Remote-controlled mirror for switching between star and calibration source
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  • Description
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  • Warranty

  • Shelyak FIGU F/9 – 50µm Fiber Injection & Guiding Unit

    The 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.

    Precision Fiber Injection for F/9 Telescopes and 50µm Fibers

    The 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.

    Integrated Guiding and Calibration via a 200µm Fiber Input

    This 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.

    FIGU F/9 vs. F/6: Adapting for Slower Optical Systems

    This 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.

  • What is the purpose of the Shelyak FIGU F/9?

    The 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 F/9 telescope and inject it precisely into the 50µm optical fiber that feeds a spectrograph like the Shelyak eShel, enabling you to perform scientific spectral analysis.

    Do I need a separate guide camera for the FIGU F/9?

    Yes, a guiding camera is required but not included. 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.

    How do I switch between my star and my calibration lamp with the FIGU F/9?

    The FIGU F/9 contains a remote-controlled mirror 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.

    Why do I need the F/9 version of the FIGU instead of the F/6 version for my SCT?

    Standard 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.

    What spectrographs is the FIGU F/9 – 50µm designed for?

    This unit is designed as a core component for Shelyak's own spectroscopy systems. It is the standard fiber injection unit for the eShel and Whoppshel spectrographs when used with an F/9 telescope.

    How does the FIGU F/9 help me get an accurate spectrum of Vega (Alpha Lyrae) with my C8 at F/9?

    First, 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.

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