William Optics GT-102 - 20th Anniversary Limited Edition - Checked & Tuned

William Optics GT-102 - 20th Anniversary Limited Edition - Checked & Tuned


Special - Shipped 10-20 working days.

Model:  wo-gt-102
Part Number:  A-F102GT
Brand:  William Optics

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 :-) 

20th Anniversaary Limited Edition - Checked & tuned, for details see here

The William Optics GT-102 APO Triplet refractor features a 3-element f/6.9 objective with an Ohara FPL-53 extra-low-dispersion glass element for optimum colour correction and an all-new 3" Victory Edition Diamond  dual-speed crayford focuser. 

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

A William Optics 0.8x focal reducer is also available to reduce the focal-ratio to a fast f5.52 

An excellent choice for astrophotography!

Included in the Box

  • GT-102 OTA
  • High Quality Soft Carry Case
  • Case Shoulder Strap
  • 2x CNC Mounting Rings
  • Dovetail Plate
  • Large 2" Rotolock
  • 1.25" Rotolock
  • 2 Year Warranty Card

Back Focus Diagram

Product Specifications



Focal Ratio


Focal Length


Objective designed

3 elements Air-spaced with FPL53 glass

Resolving Power

1.13 arc "

Limiting Magnitude


Image Circle

Full Frame

Lens Shade



OD 3" Victory Ed. Crayford focuser ,360° Rotating Camera-angle Adjuster
1.25" Adapter Included

1.25" Adapter

Brass Compression Rings

Tube Diameter


Mounting Rings


Tube Length

27" (689mm) Fully Retracted

Tube Weight

11 lbs. (5.0kg)


High Quality Soft Case (Optional accessory)

Case Dimensions

31" x 10" x 13 "

(W x H x D)

(78cm x 25m x 34cm)

William Optics GT-102 - 20th Anniversary Limited Edition - Checked & Tuned Questions & Answers

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October 2017 / View Older
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