William Optics Gran Turismo 71 OTA. f/5.9 triplet APO, 2.5” R&P Focuser in Red with Free CAA63 Rotator and FLAT6AIII Flattener

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

William Optics GT71 Red Triplet APO Refractor Specifications

• Aperture: 2.8" (71 mm)

• Focal Ratio: f/5.9

• Focal Length: 420 mm

• Resolving Power: 1.62"

• Limiting Stellar Magnitude: 11.1

• Objective: Triple element air-spaced with FPL-53 glass

• Dew Shield: Retractable

• Focuser: 2.5" Rack & Pinion with 1:10 fine focus and 1.25" adapter

• Field Stops: Baffles

• Mounting Hardware: Rings with Dual Side dovetail

• Tube Diameter: 82 mm

• Dew Shield Diameter: 92 mm

• Tube Length Fully Retracted: 325 mm

• Tube Length Fully Extended: 427 mm

• Tube Weight: 4.9 lbs.