William Optics All New Gran Turismo 71 APO Refractor, 2.5" R&P Focuser - A-F71GTII

William OpticsSKU: A-F71GTII-RD

Style: Red
Sale price$1,172 CAD
In stock: 5 unit(s) - Most orders placed by 2PM EST will be shipped out the same day (weekdays)


From its immaculate CNC-machined powder white aluminum tube to its elegant red trim, the stunning new William Optics 71 mm Gran Turismo APO Refractor is a sight to behold. But external good looks are not the only feature that makes the GT71 the crown jewel of the apochromatic refractor world. It contains a 3-element objective that utilizes FPL-53 extra-low dispersion glass for lowering any less important spectral lines to an unbelievable extent.

Optically Unmatched

  • Triplet air-spaced objective using FPL-53 glass in a modifiable extremely high precision CNC machined lens cell
  • Excellent color correct and outstanding sharpness
  • With an f/5.9 focal ratio, the WO GT71 refractor is optimized for astrophotography
  • Each lens has full multi-coatings with all surfaces containing a special super-high transmission coating (STM)

2.5" Rack & Pinion Focuser

  • Ultra smooth 1:10 dual-speed 2.5" rack & pinion focuser with no image shift
  • Comes with two locking screws on angled positions to allow for applications with bulky payloads
  • Large aluminum knob with integrated thermometer

William Optics DSD 210 Plate

  • The William Optics DSD 210mm (8.27") dovetail plate has both a Vixen and Arca Swiss size at each end of the plate. The plate has two 1/4-20 threaded holes.

CNC Carry Handle

  • Color anodized to match the WO refractor
  • Accepts the William Optics UniGuide Slide Base Guide scope and the 50 mm Slide Base Guiding Rings. Both of these are not included with this purchase, but can be found in the Recommended Accessories section. The saddle handle bar accepts Synta-style dovetails.

Patented Design

  • Both sides as well as the back have stainless steel reinforcement inserts for taking on heavy loads without any problems
  • Precise camera alignment via graduated scale

Elegant Finish

  • Powder white CNC-machined aluminum tube with elegant red trim accents, lens cap, and retractable dew shield
  • Supreme quality anodizing
  • Light and compact enough to carry on an airplane


SKU Number
Model Number
Telescope Series
William Optics GT
Focal Ratio
Optical Design
Telescope Aperture
71mm (2.8")
Telescope Mount Type
No Mount - OTA Only
Type of Electronics
OTA Only - No Electronics
Number of Refractor Elements
3 (Triplet)
Focal Length (mm)
420 mm
Limiting Stellar Magnitude
Focuser Style
Rack & Pinion
Focuser Size
Focuser Speed
Dual Speed
Telescope OTA Outside Diameter (in.)
3.2" (81 mm)
Refractor Dew Shield Diameter (in.)
3.6" (91 mm)
Telescope OTA Weight (lb.)
5 lb
Refractor OTA Length - Extended (in.)
16.8" (426.72 mm)
Refractor OTA Length - Retracted (in.)
12.8" (325.12 mm)
William Optics - 2 Years

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