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William Optics Gran Turismo 81 APO Triplet Refractor Telescope - Gray


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  • This 81mm refractor is premium for astrophotography and visual astronomy
  • Apochromatic f/5.9 three-element objective with FPL-53 glass
  • The telescope and all of the accessories included are anodized to match each other, making the scope visually appealing

Product Details

  • The William Optics Gran Turismo 81mm refractor in space gray features a CNC machined optical tube for ease of use. The CNC handle bar is sturdy enough for optimal portability while also acting as a slide base for compatible guiding accessories! These include the William Optics slide base 50mm guide rings and WO UniGuide 50mm Guide Scope (both are not included).
  • specifications

    Aperture81 mm (3.25")
    Camera/Eyepiece Connection1.25" Nosepiece
    Dawes Limit1.43 arcseconds
    Focal Length478 mm
    Focal Ratiof/5.9
    Free ShippingYes
    Highest Magnification162x
    Light Gathering Power134x
    Optical DesignTriplet Refractor
  • included items

    • 2.5" Rack and Pinion Focuser
    • Camera Angle Rotator
    • CNC Handle Bar
    • Bahtinov Mask Cover
    • Mounting Rings
    • Dovetail Plate
    • High Quality Soft Carry Bag

Product Reviews

Customer Reviews
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United States United States

OPT W.O telescope

Excellent service and guidance!

Howard R.
United States United States

Professional-grade engineering, construction & optical performance

This scope has the fit, finish & feel of a premium-quality professional instrument, with robust machined parts and exquisite finish of metal & paint. Focuser action is smooth, and will easily support my heavy DSLR at high elevation angles. Optically it seems virtually perfect, though I am not yet an experienced imager. Visually, at the powers I’ve used, there is no false color. One observation, however, is that in order to give pinpoint stars to the corners of a full 35 mm frame, the field flattener is a must. Otherwise the useable field is less than APS-C size. With it, I have only a trace of elongation in one corner to suggest that centering or perpendicularity could be tuned up. This might be improved with adjusting the spacing of the flattener (easily done). Mated to a small GEM or az-el mount on a tripod, the GT81 would be an ideal field/vacation optic for visual observation & imaging alike, and the sheer quality of this instrument makes one wish that William Optics made a just-right sized mount for its small refractors. It’s as beautiful to look at as it is a joy to use.

OPT Telescopes William Optics Gran Turismo 81 APO Triplet Refractor Telescope - Gray ReviewOPT Telescopes William Optics Gran Turismo 81 APO Triplet Refractor Telescope - Gray Review