William Optics Gran Turismo GT 71 AP Astro Package red (SKU: A-F71GTII-RD-AP) William Optics telescopes opinie

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William Optics Gran Turismo GT 71 II in red (white with red elements), with a dedicated FLAT 6A III flat field corrector (WO P-FLAT6AIII).

The William Optics Gran Turismo GT 71 II is the latest version of the compact apochromat which, in terms of color correction and image sharpness, leaves other products in its class far behind.

The heart of this telescope is the three-element APO-ED optical system. One of the most perfect optical materials, synthetic fluorite, was used to produce the low-dispersion lens. This material, produced by the renowned Japanese company Ohara under the designation FPL-53, is characterized not only by a high Abbe number, but, equally importantly, it is much more chemically stable than natural crystalline fluorite. The use of carefully selected types of glass and the SMC coating of the lenses means that the image obtained with the William Optics Gran Turismo GT 71 II telescope is unmatched in terms of sharpness, detail and contrast.

The set with the optical tube includes a professional focal reducer and flattener FLAT 6A III. This is a triplet made of carefully selected optical glasses manufactured by Ohara, which allows cooperation with both full-frame sensors, as well as APS-C and M4/3 formats.

The telescope tube is mounted on precisely made clamps, equipped with a Vixen socket for mounting a finder or guide scope, as well as a Vixen / Arca-Swiss foot.

Key Features of the William Optics Gran Turismo GT 71 II Telescope

• apochromatic triplet with an air gap and a low-dispersion element made of Japanese FPL-53 glass (synthetic fluorite)
• three-element focal reducer/flattener with a magnification of 0.8x with the possibility of mounting filters mounted in a socket with an M48 thread
• solid rack & pinion type focuser equipped with coarse and fine focus adjustment knobs
• optical tube clamps made using CNC technology
• mounting foot compatible with Vixen and Arca-Swiss sockets, allowing the tube to be mounted on a mount or photographic tripod

Technical parameters

• telescope optical system: APO-ED triplet with air gap
• flattener / focal reducer: FLAT 6A III
• Flattener/Focal Reducer optical system: Triplet with Fully Multi-Layer Coating (FMC)
• flattener/focal reducer ratio: 0.8x
• Lens diameter: 71 mm
• focal length (without FLAT 6A III): 419 mm
• focal length (with FLAT 6A III): 335 mm
• aperture (without FLAT 6A III): f/5.9
• aperture (with FLAT 6A III): f/4.7
• ED lens material: FPL-53 glass (Ohara, Japan)
• optical system coating: SMC coating
• compatible sensor sizes: APS-C, full frame
• compatible camera systems (via interchangeable T-rings): Canon EF, Nikon F, Sony E, Pentax, Micro 4/3, Fuji FX
• back focus (for FLAT 6A III): 64.1 mm
• correction (for FLAT 6A III): 9.1 mm
• focuser: 2.5" with 2" reduction and 1.25" adapter
• type of eyepiece: rack & pinion, dual speed
• thread for connecting a flattener/focus reducer: M63
• finder footer: Vixen
• mounting bracket: Vixen / Arca-Swiss
• tube length (folded): 392 mm
• tube length (unfolded): 470 mm
• tube weight: 2.95 kg
• tube finish: white and red

Set components

• William Optics Gran Turismo GT 71 II refractor
• FLAT 6A III flattener / focal reducer with CAA63 rotator
• dewclaw
• Bahtinov mask with mount
• lens cap
• Vixen / Arca-Swiss mounting clamps
• transport cover

Guarantee

24 months