William Optics GT-81 II - Checked & Tuned

Now: £949.00 (Save:  £250.00) Was:  £1,199.00✓ 2 year warranty

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About this product

Model:  wo-gt-81_II_gd
Part Number:  A-F81GTIIGD

ES Reid Checked Telescope

Es Reid is highly regarded in the optical industry so to ensure our William Optics triplet refractors perform at their very best we send them to him for checking and, if necessary, tuning on his optical bench. 

You can order your telescope with confidence knowing it will have well figured optics, negligible false colour and spherical aberration, and no astigmatism (the bane of any optical system!). Star shapes will be round, not triangular, oval or egg-shaped!

You know it makes sense :-) 

Checked & tuned, for details see here

The William Optics GT-81 APO Triplet refractor features a 3-element f/5.9 objective with an Ohara FPL-53 extra-low-dispersion glass element for optimum colour correction and a new upgraded dual-speed 2.5-inch Rack and Pinion focuser with a smoother action and no image shifting with a capacity of up to 6.8kg (15lb). 

The Hotech SCA Field Flattener is an excellent match for this telescope.  

The William Optics 0.8x focal reducer is also available to reduce the focal-ratio to a fast f4.72. 

An excellent choice for astrophotography!

Includes mounting bracket, carry handle, finder/guider rings and high quality soft carry case.

FEATURES

    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" Rack and Pinion Focuser

  • New ultra smooth 2.5" Rack and Pinion focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting (capacity 6.8kg / 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 Aluminium tube, gold trim finish, retractable dewshield, dewshield cap.
  • Top quality anodising.
  • 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!

Product Videos

What's in the box

  • Telescope OTA
  • Vixen compatible L-Bracket
  • Carry Handle
  • Guiding / Finder rings
  • 2" Extension Tube
  • 2" to 1.25" Adapter
  • Soft Carry Bag

Specifications

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 Shade Retractable
 V-power Focuser 45mm drawtube, 1:10 fine focus

 

1.25" Adapter
Field Stops Knife-Edge Baffles
L-type Mount Bracket
Tube Diameter 90mm
Tube Length (440 mm) Fully Retracted

 

(484 mm) Fully Extended
Tube Weight 8 lbs.( 3.7kg)

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