William Optics Gran Turismo 81 APO 20th Anniversary Refractor - DISCONTINUED

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  • Regular price $1,188.00

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William Optics Gran Turismo 81 APO 20th Anniversary Refractor - DISCONTINUED

Soft carry bag included!

The new 2016 GT81 three-element super APO Anniversary offer superb quality for imaging and visual use at an affordable price!From the pristine white finish on the CNC to the elegant gold trim which has more than just good looks...

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.

2.0" Crayford V-power Focuser

  • New ultra smooth 2" Crayford V-power edition focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting (capacity 15lb.)!
  • Comes with two locking screws on angled positions for heavy load applications.
  • Chromed, soft thumbscrews, easy to use even with gloves on.

Patented Design

  • Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
  • diamond-coated drive system: very smooth, no lateral movement or tilting.
  • Graduated scale for precise camera alignment.
  • Innovative Bahtinov Mask Cover (Patented) included.

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.
  • Carry handle with V-shape night glowing illuminator.
  • 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!
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Aperture81 mm (3.25")
Focal Length478 mm
Focal Ratiof/5.9
Free ShippingYes
Glass TypeFLP53
Limiting Magnitude12.2
ManufacturerWilliam Optics
Optical TypeTriplet
Tube Diameter90mm
Tube Length440mm
Tube Weight3.7kg (8 lbs)


  • William Optics GT81 f/5.9 Triplet APO Refractor - 20th Anniversary
  • APO Flattener/Reducer for GT81(T-Ring sold separately)
  • Soft Carrying Case
  • 2" Focuser
  • Mounting Rings w/Integrated L-bracket and Carry Handle
  • Lens Cap
  • 2" and 1.25" Adapters w/Brass Compression Rings