William Optics Gran-Turismo 81 WIFD Space Grey telescope (SKU: T-GT-81SG-WIFD)

William Optics Gran-Turismo 81 WIFD telescope, Space Grey (SKU: T-GT-81SG-WIFD) is an 81 mm apochromatic refractor with a triplet incorporating Ohara FPL-53 glass. The internal WIFD focuser adjusts focus by moving the assembly inside the tube, leaving the attached camera in a fixed position.

Key features

• triplet with FPL-53 with a 478 mm focal length and f/5.9 focal ratio
• internal WIFD focuser with provision for an EAF motor
• rotator M92 and M92 to M63 adapter
• mounting plate compatible with Vixen and Arca-Swiss standards
• option to select a separate flattener or reducer

Included items

• optical tube Gran-Turismo 81 WIFD with focuser and rotator
• cap with Bahtinov mask
• adapter M92 to M63
• rings with handle and Vixen / Arca-Swiss mounting plate
• soft carrying case
• hex keys

Technical specifications

• manufacturer: William Optics
• manufacturer’s code: T-GT-81SG-WIFD
• optical design: apochromatic triplet with Ohara FPL-53
• aperture: 81 mm
• focal length: 478 mm
• focal ratio: f/5.9
• image circle diameter specified by the manufacturer: 45 mm
• focuser: WIFD, rack and pinion
• actual focuser travel: 0–75 mm
• tube length: 420–500 mm
• weight of the OTA: 3.58 kg
• total weight specified by the manufacturer: 4.56 kg
• colour: Space Grey

WIFD helps keep the camera position fixed during focusing, while modular connections allow the imaging train to be configured as needed.