The Williams Optics Gran Turismo 81 WIFD is a three-element apochromatic refractor, with lenses using FPL-53 glass. This telescope produces images with unsurpassed aberration correction.

William Optics Internal Focus Design

The Gran Turismo 81 WIFD is the first of the GT series to include the William Optics Internal Focus Design (WIFD) system. This innovative and revolutionary design combines a precision (patented) internal focusing mechanism with the highest quality optics available, providing the ultimate Apochromatic refractor for astrophotography.

Designed from the ground up with the ability to handle the newest generation of large, heavy, high-resolution cooled cameras, the rock-solid optical tube assembly is uncompromised in quality. The movement of the focuser is integrated inside the main tube assembly, so there are no movements of a focuser drawtube visible from the outside.

More importantly, the weight of the imaging train (camera, filter wheel, off-axis guider, rotator, etc.) is not borne by the focuser drawtube. This eliminates problems of flop and collimation, ensuring excellent imagery.

The user can enjoy the benefits of a traditional two speed fine focuser, while not worrying about limitations typically found in traditional rear mounted focusers.

WIFD focuser

Specifications of the William Optics Gran Turismo 81 WIFD

Lens Type Triplet Apochromatic Prime Lens
Focal Length 478mm
Aperture 81mm
Focal ratio f/5.9
Optional Flatteners FLAT6AIII 0.8x
FLAT68III 1.0X (Requires WIFD Extension Adapter)
Focuser WIFD
Compatible with EAF
Color Red
Lens Material FPL-53
Strehl Ratio 0.95+
Image circle 45mm
Camera Format Up to full frame
Test Report Included
OTA Weight 7.3 lbs (3.3 kg)
Total Weight 9.9 lbs (4.5 kgs)
Tube Length (Retracted) 420mm
Tube Length (Extended) 500mm

Click here for MANUAL-T-GT-81-WIFD

Spot and longitudinal aberration diagrams (for each flattener)

Spot diagram with FLAT68IIILongitudinal aberration with FLAT68IIISpot diagram with FLAT6AIIILongitudinal aberration with FLAT6AIII

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Optional Products

Williams Optics Gran Turismo 81 WIFD Refractor Telescope

SKU: N/A

$3,499.00

✅ Fast Shipping & Tracking
✅ Stocked in Melbourne, Australia
✅ Expert Advice
✅ Lifetime Technical Support

    Need Expert Advice?

    Visual Astronomy, Astrophotography, Microscopy and Macro Photography can be a little complicated sometimes as there are a lot of options. If you'd like to check something before you purchase just let us know and we'd be happy to help!

    Enquire now or call us (03) 9042 2293

    Williams Optics Gran Turismo 81 WIFD Refractor Telescope

    SKU: N/A

    $3,499.00

    The Williams Optics Gran Turismo 81 WIFD is a three-element apochromatic refractor, with lenses using FPL-53 glass. This telescope produces images with unsurpassed aberration correction.

    William Optics Internal Focus Design

    The Gran Turismo 81 WIFD is the first of the GT series to include the William Optics Internal Focus Design (WIFD) system. This innovative and revolutionary design combines a precision (patented) internal focusing mechanism with the highest quality optics available, providing the ultimate Apochromatic refractor for astrophotography.

    Designed from the ground up with the ability to handle the newest generation of large, heavy, high-resolution cooled cameras, the rock-solid optical tube assembly is uncompromised in quality. The movement of the focuser is integrated inside the main tube assembly, so there are no movements of a focuser drawtube visible from the outside.

    More importantly, the weight of the imaging train (camera, filter wheel, off-axis guider, rotator, etc.) is not borne by the focuser drawtube. This eliminates problems of flop and collimation, ensuring excellent imagery.

    The user can enjoy the benefits of a traditional two speed fine focuser, while not worrying about limitations typically found in traditional rear mounted focusers.

    WIFD focuser

    Specifications of the William Optics Gran Turismo 81 WIFD

    Lens Type Triplet Apochromatic Prime Lens
    Focal Length 478mm
    Aperture 81mm
    Focal ratio f/5.9
    Optional Flatteners FLAT6AIII 0.8x
    FLAT68III 1.0X (Requires WIFD Extension Adapter)
    Focuser WIFD
    Compatible with EAF
    Color Red
    Lens Material FPL-53
    Strehl Ratio 0.95+
    Image circle 45mm
    Camera Format Up to full frame
    Test Report Included
    OTA Weight 7.3 lbs (3.3 kg)
    Total Weight 9.9 lbs (4.5 kgs)
    Tube Length (Retracted) 420mm
    Tube Length (Extended) 500mm

    Click here for MANUAL-T-GT-81-WIFD

    Spot and longitudinal aberration diagrams (for each flattener)

    Spot diagram with FLAT68IIILongitudinal aberration with FLAT68IIISpot diagram with FLAT6AIIILongitudinal aberration with FLAT6AIII

    Reviews

    There are no reviews yet.

    Be the first to review “Williams Optics Gran Turismo 81 WIFD Refractor Telescope”

    Your email address will not be published. Required fields are marked *

    Optional Products

      Need Expert Advice?

      Visual Astronomy, Astrophotography, Microscopy and Macro Photography can be a little complicated sometimes as there are a lot of options. If you'd like to check something before you purchase just let us know and we'd be happy to help!

      Enquire now or call us (03) 9042 2293