The William Optics Gran Turismo 81 refractor is a three-element apochromatic refractor using FPL-53 glass, with a diameter of φ = 81 mm and a focal ratio of f/5.9.
The tube is equipped with an excellent 2.5-inch Rack and Pinion focuser with a 10:1 microfocus, smooth-running, stable - you can rely on it.
The telescope has a retractable dew shield and a Vixen standard mounting foot, and the high quality of fit and finish has long been a hallmark of William Optics products.
So we have beautiful astrophotography equipment - for connoisseurs.
The telescope comes with a dedicated FLAT6AIII flattener and a WO 32 mm guider.
• construction: apochromatic triplet using FPL53 glass
• aperture: 81 mm
• aperture: f/5.9
• focal length: 478 mm
• extendable dew shield: included
• dovetail rail: included
• carrying handle: on clamps, included
• Bahtinov mask: included
• camera position rotator: yes, included
• soft transport case: included
• extension: 2.5" Rack and Pinion, 10:1 microfocus
• recommended flattener: FLAT 6A III (included)
• application: APS-C, Full Frame
• length: 390 - 460 mm (depending on the position of the dew shield)
• weight: 3.9 kg
2 years
• Object : M31, the Andromeda galaxy
• Setup : Sky-Watcher EQ6-R, guided ASI120 Mini, William Optics Gran Turismo 81 IV with 6A III flattener, ZWO ASI 2400 MC cooled camera;
• Made by : RGB with Bortle 2 (see: Bortle Scale in Wiki), 27 x 240 s, September 2020
(click to enlarge)
