Gran Turismo 71 APO Refractor (A-F71GT)

Gran Turismo 71 APO Refractor (A-F71GT)

The stunning new William Optics Gran Turismo 71 Apo is the new jewel of the apochromatic refractor world. The new GT71 features a 3-element objective using high-quality FPL-53 extra-low dispersion glass that reduces any secondary spectrum to an unbelievable degree.

  • Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell.
  • Extremely sharp with 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
• Extra-smooth 360 deg. rotatable 2.5" R&P focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting!
• Comes with two locking screws on angled positions for heavy load applications.
• Large aluminum knob with installed thermometer.

Simply Beautiful Finish
• 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.

What is in the box

Soft carry case, Case shoulder strap, 1.25” & 2” adapter, GT71 APO Telescope, Aluminum knob Protection cap,2 mounting rings, Dovetail Plate.


  • Aperture: 71mm
  • Focal Ratio: F/5.9
  • Focal Length: 420mm
  • Resolving Power: 1.62”
  • Limiting Magnitude: 11.1
  • Objective Type: 3 elements Air-spaced with FPL53 glass
  • Lens Shade: Retractable
  • R&P Focuser: 2.5" 360° Rotating Camera-angle Adjuster, 1:10 fine focus 1.25" Adapter
  • Field Stops: Baffles
  • Type of mount: Includes mounting rings and Vixen style dovetail
  • Tube Diameter: 82mm (dew shield tube 92mm)
  • Tube Length: (325 mm) Fully Retracted; (427 mm) Fully Extended
  • Tube Weight: 2.2kg

Specification for Apochromatic Lenses

All WO refractors objective are double tested and inspected before shipping to our customer, these telescopes are free of coma and astigmatism.