William Optics Apochromatic refractor AP 71/420 Gran Turismo GT 71 OTA (75650)

The Gran Turismo refractor is an apochromatic triplet telescope with an FPL-53 element, delivering outstanding color correction and high contrast. This versatile scope is designed to meet the needs of demanding observers and astrophotographers alike.

Visual Observation:
When paired with an optional diagonal, the GT 71 offers stunning, high-contrast views of the Moon and planets. Its fast optics also allow you to enjoy deep sky objects—such as star clusters, galaxies, and nebulae—with crisp, pinpoint stars, making globular cluster observation and analysis especially enjoyable.

Astrophotography:
For imaging, William Optics recommends the Flat6AIII field flattener/reducer. The triplet lens design ensures a flat, well-focused field, ideal for full-frame cameras. You can easily mount a guiding scope using the integrated prism rail adapters on the carrying handle, letting you use it as either a finderscope or for guiding.

The robust 2.5” rack-and-pinion focuser features a long travel range, precision reduction, and a built-in temperature display. The telescope also comes with an adapter for 1.25” eyepieces.

Portable and Rugged:
The Gran Turismo is built for travel and mobile astronomy or astrophotography. Take it under dark skies and explore the best Messier and NGC objects. This telescope is reliable, easy to use, stable, and may quickly become your favorite companion from the very first night!

Special Feature: Bahtinov Focus Mask
The latest William Optics apochromats come with a specially engineered Bahtinov focus mask made from optical acrylic glass, providing 92% transparency. The etched pattern produces a diffraction effect that’s about three times brighter than standard metal masks, making precise focusing much easier—even on fainter stars.

The guidescope shown is not included in the scope of delivery! 

Specifications

Optics

• Type: Refractor (Apochromat, Triplet lens)

• Aperture: 71 mm

• Focal Length: 420 mm

• Focal Ratio: f/5.9

• Resolving Power: 1.94 arcseconds

• Limiting Magnitude: 11.1

• Light Gathering Power: 100× the naked eye

• Maximum Useful Magnification: 142×

Mechanical

• Tube Weight: 2.2 kg

• Tube Diameter: 82 mm

• Tube Length: 427 mm

• Carrying Length: 325 mm

• Dew Cap Diameter: 92 mm

• Coating: SMC multi-coating

• Stray Light Baffles: Yes

Focuser

• Type: Rack and pinion

• Eyepiece Connection: 2"

• Free Aperture: 64 mm

• Ring Clamp: Yes

• Fine Focusing: 1:10 gear reduction

Mount

• Type: OTA (Optical Tube Assembly only; no mount included)

Included Accessories

• Dew Shield: Yes

• Eyepiece Adapter: 2" / 1.25"

• Prism Rail: Vixen-style

• Bahtinov Focus Mask: Yes

• Carrying Handle: Yes

• Carry Case: Yes

• Finder Scope: Not included

• Diagonal: Not included

General

• Series: Gran Turismo

• Color: Red

Recommended Uses

• Astrophotography: Yes (excellent)

• Moon & Planets: Yes

• Nature Observation: No

• Nebulae & Galaxies: Yes

• Solar Observation: No (only with a suitable solar filter)

User Level

• Beginners: No

• Advanced Users: Yes

• Observatories: No