William Optics

Gran Turismo 81 f/5.9 Triplet APO


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  • Regular price $1,198.00

3 IN STOCK


Innovative Bahtinov Mask Cover (Patented) & New Dovetail Plate included!

The new 2019 GT81 three-element super APO Anniversary offer superb quality for imaging and visual use at an affordable price!From the pristine white finish on the CNC to the elegant gold trim which has more than just good looks...

Optically Unbeatable

  • Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell.
  • Extremely sharp.
  • Excellent color correction.
  • Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces.
  • This F/5.9 lens is ideal for astrophotography.

2.5”R&P Focuser

2.5”R&P Ultra robust focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting! Heavy duty: perfect for your accessories.

Simply Beautiful Finish

Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dewshield, dewshield cap.

Top quality anodizing.

Very compact for carrying on flights.

Attention to Details

2" & 1.25" adapter included in the price.

Anti-marring brass compression rings.

90mm mounting rings are optional.

Though you will never need it, you have a 2-year warranty from WO, and the certainty that we will be there to assist you even beyond that, if you need!

     

    Aperture

    81 mm (3.25")

    Focal Length

    480 mm

    Focal Ratio

    f/5.9

    Glass Type

    FPL-53

    Optical Design

    Triplet

    Tube Weight

    9 lbs

    Tube Length (retracted)

    390mm

    • Mounting Rings
    • New 2019 CNC Carry Handle Bar
    • New Dovetail Plate
    • 2.5” R&P Focuser
    • Innovative Bahtinov Mask Cover (Patented)
    • Soft Carry Case
    SKU: A-F81GTIIIGD
    Barcode: