William Optics Star 71mm APO f/4.9 Refractor Telescope

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  • Regular price $1,148.00
  • William Optics Star 71mm APO f/4.9 Refractor Telescope

    • Sale
    • Regular price $1,148.00
    • ITEM #

    Already have gear? Trade it in for cash or new equipment.
    • Aperture: 71 mm
    • Focal Ratio: f/4.9
    • Focal Length: 350.2 mm
    • Comes with Rings

    William Optics Star 71mm APO f/4.9 Refractor Telescope

    The Star 71 mm APO f/4.9 Refractor Telescope by William Optics is a 71 mm (2.8-inch) aperture Imaging Refactor OTA. It is shipped complete with Mounting Rings and a Vixen-style Dovetail base.

    "This is the best imaging scope we ever built" says William Optics founder and CEO, William Yang, in describing this new apochromatic refractor.

    In addition to utilizing the highest-quality FPL-53 glass, four elements are configured in three groups- a unique, patented design- not the conventional objective/ flattener/ reducer design, that affords pinpoint stars from edge to edge covering a 45 mm full-frame imaging circle - an astrophotographer's dream especially since this little jewel of a telescope includes a robust 2.5-inch dual-speed rack and pinion focuser that even incorporates a temperature gauge. The drawtube terminates in male M48 thread to which a wide M48-Canon EOS adapter ring (included) can be attached.

    This is not a conventional 2-inch focuser tube with locking thumbscrews. For those wishing to use this very portable telescope as a visual instrument, an optional 1.25-inch 90-degree dielectric-mirror diagonal is available separately. The diagonal comes with a custom adapter that connects directly to the telescope.


    Telescope Specs: 

    • Aperture: 71 mm
    • Focal Ratio: f/4.9
    • Focal Length: 350.2 mm
    • Objective Type: 4 elements in 3 groups - patented 2-1-1 Configuration
    • Lens Shade Retractable
    • Focuser: 2.5” Dual Speed Rack & Pinion
    • Focuser Drawtube travel: 1.38" / 35mm
    • Image Circle: 45 mm
    • Type of Mount: Mounting rings with Vixen style dovetail
    • OTA Tube Weight: 4.5 lb / 2.05 kg
    • Tube Weight with Rings & Dovetail: 5.3 lb / 2.4 kg


    Additional Information

    Aperture71 mm (2.8")
    Dew ShieldLens Shade/ Retractable
    Focal Length350.2mm
    Focal Ratiof/4.9
    FocuserRack and Pinion/ 2.5"/ Dual speed
    ManufacturerWilliam Optics
    Objective Type4 Elements in 3 Groups (2/1/1)
    Optical DesignDoublet
    Prism MaterialFPL53 Glass
    Weight4.19 pounds/ OTA

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