William Optics Gran Turismo 81 APO Triplet Refractor Telescope

  • GT81 APO
  • 2" & 1.25" Adapter Included
  • Bahtinov Mask Included
  • STM Multi-Coated Lenses
  • F/5.9
  • Sale
  • Regular price $1,398.00

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William Optics Gran Turismo 81 APO Triplet Refractor Telescope

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


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!



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