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William Optics Gran Turismo 81 APO Triplet Refractor Telescope


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  • GT81 APO
  • 2" & 1.25" Adapter Included
  • Bahtinov Mask Included
  • STM Multi-Coated Lenses
  • F/5.9

Product Details

  • The William Optics Gran Turismo 81 Triplet is designed to deliver incredible image quality in a compact package. Sitting at a respectable ratio of f/5.9, this FPL53 triplet is well-balanced in light-gathering power. This is no ordinary refractor.

    Optically Unbeatable

    • Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell.
    • Extremely sharp.
    • Excellent color correction.
    • Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces.
    • This F/5.9 lens is ideal for astrophotography.

    R&P Focuser

    2.5” R&P Ultra robust focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting! Heavy duty: perfect for your accessories.

    Simply Beautiful Finish

    Pure William Optics quality fit and finish powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dew shield, dew shield cap.

    Top quality anodizing.

    Very compact for carrying on flights.

    Attention to Details

    2" & 1.25" adapter included in the price.

    Anti-marring brass compression rings.

    90mm mounting rings are optional.

    Though you will never need it, you have a 2-year warranty from WO and the certainty that we will be there to assist you even beyond that, if you need!

    Package Contents:

    Mounting Rings

    GT81 OTA

    CNC Carry Handle Bar

    Dovetail Plate

    2.5” R&P Focuser

    Bahtinov Mask Cover


    Soft Carry Case

    Two-year, no fuss warranty and constant customer service!


  • specifications

    Aperture81 mm (3.25")
    Focal Length480 mm
    Focal Ratiof/5.9
    Free ShippingYes
    Glass TypeFPL53
    Optical DesignTriplet Refractor
    Tube Weight13 lbs
  • included items

    • GT81 APO
    • 2" & 1.25" Adapter Included
    • Bahtinov Mask Included
    • STM Multi-Coated Lenses
    • F/5.9

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