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Gran Turismo 81 Twenty Years Anniversary Edition (discontinued)

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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.

Simply Beautiful Finish

·  Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dewshield, dewshield 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!

Flourostar 132 Photo Performance by Cat Zhang

GT81 Performance

GT81 Performance

More Information



Focal Ratio


Focal Length


Resolving Power


Limiting Magnitude


Objective Type

Three element with FPL-53 Air Spaced, Fully Multi-Coated,STM coatings

Lens Shade


 V-power Focuser

45mm drawtube, 1:10 fine focus

1.25" Adapter

Field Stops

Knife-Edge Baffles

L-type Mount


Tube Diameter


Tube Length

(440 mm) Fully Retracted

(484 mm) Fully Extended

Tube Weight

8 lbs.( 3.7kg)



Optical Performance
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