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.
Optically Unbeatable
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.
Patented Design
Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
Graduated scale for precise camera alignment.
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.
Specification for ED Lenses
All William Optics refractor objectives are double tested and inspected by WO at their factory. These telescopes are free of coma and astigmatism. Since all individual lens surfaces are machine coated, sometimes you may notice minor visual imperfections which will not compromise the optical performance of the telescope. The dimensions of scratches and points shall not exceed the following values:Scratches - Maximum Width: 0.025 mm
Scratches - Maximum Length: 1/4 of total lens diameter
Scratches - Maximum Quantity: Three
Dots or Spot Points - Maximum Diameter: 0.4 mm
Dots or Spot Points - Maximum Quantity: Three
Accumulation of Defects - Limited Area: 0.8mm^2
Accumulation of Defects - Total Area: 5.8mm^2
William Optics Gran Turismo 71mm ED APO Refractor
Aperture: 71mm
Focal Ratio: f/5.9
Focal Length: 419mm
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
Type of mount: Includes mounting rings and Vixen style dovetail
Tube Diameter: 82mm （dew shield tube 92mm）
Tube Length: (392 mm) Fully Retracted; (470 mm) Fully Extended
Tube Weight: 2.95kg
Recommended Flattener - FLAT 6A III
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.
Amazing
Reducing factor 0.8X.
Adjustable design, for perfect back focus it can be used with other models of refractor
48mm filter ready
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 71 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.
SCOPE OF DELIVERY
William Optics 71 mm ED Refractor OTA
2" 2 speed, rotating rack and pinnion focuser
2", 1.25" adapters with brass compression rings
Integrated mounting ring with L bracket
Retractable lens shade
Innovative Bahtinov Mask Cover
Lens cap
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 GT71 for a night of deep-sky astrophotography on a moment’s notice.
Impressive Features
The built-in star-spikes Bahtinov mask makes focusing your DSLR camera through the telescope quick and easy. Simply point the telescope at a bright star, and position the central spike evenly between the “X”.The telescope is held securely inside the mounting rings and can be adjusted back and forth to improve balance if necessary.