The William Optics Gran Turismo 81 Triplet is designed to deliver incredible image quality in a compact package. Sitting at a respectable ratio of f/5.9, this FPL53 triplet is well-balanced in light-gathering power
This is no ordinary refractor.
The Gran Turismo 81 is a Three Element Designed APO refractor. Using FPL-53 glass this telescope provides excellent aberration correction.
2.5″ R&P Focuser
The 2.5″ R&P Focuser is smooth, stable, and reliable! No image shifting!
New Designed Rotator
William Optics designed camera angle rotator. Smooth and stable.
CNC Handle Bar
Made by CNC with anodizing. Strong and nice look!
Bahtinov Mask
World first built in clear Bahtinov mask!
Flattener – (Not Included 2019 All New Adjustable Flat 6A III (T-mount not included))
This very elegant 2″ reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. WO Flat 6AIII will provide good illumination and flat field across 97% of full frame sized sensors.
Superb Finish
William Optics polished anodized finish.
All internal surfaces threaded and blackened to prevent reflections.
Easy to Use
Will accept any standard 48mm wide T-ring for your camera. Not compatible with smaller 42mm T rings.
Deep Sky Imaging with the Gran Turismo 81 APO
If you are new to deep sky astrophotography but have dabbled in tracked night sky shots including the Milky Way – this is likely the best possible next step for you.
Ultra-Portable Telescope
It is often said, that the best telescope is the one you use most often. With a retracted length of 392mm and convenient mounting options, you’ll have no excuse not to deploy the GT81 for a night of deep-sky astrophotography on a moment’s notice.
IMPORTANT NOTE
William Optics uses high quality steel lens cells and FPL53 glass for WO triplet series (GT and FLT) – this combination is perfect for temperature compensation and will prevent pinched optics in cold weather conditions,
Before you store the telescope you have to uncover it and let the tube to stay open for sometime. After the telescope dry up, moisture will evaporate and it can be safely stored. You must store your telescope in a dry place with constant room temperature. Otherwise lens cell will rust and lens coating will be damaged by fungus.
| TECHNICAL DATA | |
| Telescope Series | William Optics GT |
| Focal Ratio | f/5.9 |
| Optical Design | Refractor |
| Telescope Aperture | 81mm (3.19″) |
| Telescope Mount Type | No Mount – OTA Only |
| Type of Electronics | OTA Only – No Electronics |
| Number of Refractor Elements | 3 (Triplet) |
| Focal Length (mm) | 478 mm |
| Focuser Style | Rack & Pinion |
| Focuser Size | 2.5″ |
| Focuser Speed | Dual Speed |
| Refractor OTA Length – Retracted (in.) | 15.4″ (390 mm) |
| Telescope OTA Weight (lb.) | 8.71 (3.95kg) |
