GT81DDG and Case	GT81DDG in its Case

The stunning William Optics Gran Turismo 81APO is the new jewel of the apochromatic refractor world. The pristine white finish on the CNC-machined body and the elegant dark red trim give it good looks to go with the 3-element air-spaced objective lens that uses high-quality FPL-53 extra-low dispersion glass to reduce any secondary spectrum to an unbelievable degree.

At a Glance...

• Aperture: 81mm
• Focal Ratio: f/5.9
• Focal Length: 478mm
• Objective: Air-spaced triplet using FPL-53
• Coatings: Fully Multi-coated, STM Coatings
• Focuser: 2.5" 2-speed Crayford Focuser with DDG digital readout
• 2"-fit 360-degree camera-angle adjuster
• 2" to 1.25" eyepiece adapter with anti-marking brass insert
• Focus Travel: 80mm
• Weight: 2.9kg
• Length with dew shield retracted: 340mm
• Length with dew shoeld extended: 400mm
• Includes Carry Handle and rigid high-quality backpack with custom-fitted foam
• Backpack dimensions: approx 44cm x 30cm x 17cm (Water resistant)
• Backpack weight: 1.8kg

Optically Unbeatable

Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell. Extremely sharp.
Excellent colour 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” DDG Focuser

The Digital Display Gauge - DDG - allows you to take precise focusing readings to two decimal places.
Extra-smooth 360 deg. rotatable 2.5" Crayford focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting.
Comes with two locking screws for heavy loads.
Large aluminum knob with installed thermometer.

Patented Design

Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
DDG integration will make your focusing experience the best ever.
Graduated scale for precise camera alignment.

Simply Beautiful Finish

Attention to Detail