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William Optics Gran Turismo 81 IV

William Optics Gran Turismo 81 IV
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Price:  £1,195.00(Inc. 20% VAT)

Product Code:  A-F81GTIV-RD
Brand:  William Optics

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William Optics

New 2020 William Optics GT81 IV! 2020 model now includes 2.5" R&P focuser with built-in camera rotator. 

Innovative Bahtinov Mask Cover (Patented) & New Dovetail Plate included!

The new 2020 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.
  • 2.5”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 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.
  • 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!

Standard Package:

  • Telescope OTA with 2.5” R&P Focuser and with built-in camera rotator
  • New Vixen Dovetail Plate
  • Mounting Rings
  • New CNC Carry Handle Bar
  • Innovative Bahtinov Mask Cover (Patented)
  • Soft Carry Case
  • 2" to 1.25" Adapter
  • Soft Carry Bag

Optional Accessories:

  • M63 -2” Rotolock 
  • 1.25” Rotolock 
  • 2019 All New Slide-base 50mm Guiding Rings
  • All New 50mm/F4 Rotolock Guide scope 
  • New Full frame x0.8 Flattener 
  • Retracted Length:390mm
  • Tube with Rings and Dovetail Weight:3.95kg


  • Aperture: 81mm
  • Focal Ratio: F/5.9
  • Focal Length: 478mm
  • Resolving Power: 1.43"
  • Limiting Magnitude: 12.2
  • Objective Type: Three element with FPL-53 Air Spaced, Fully Multi-Coated,STM coatings
  • Lens Shield: Retractable
  • Tube Diameter: 90mm
  • Tube Length: (390 mm) Fully Retracted
  • Tube Weight: 3.84kg

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Telephone: 01353 776199 or 07990 646466

2 Rosemary Lane, Sutton nr. Ely, Cambridgeshire, CB6 2NZ
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