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William Optics Gran Turismo GT81 WIFD
William Optics Gran Turismo GT81 WIFD
William Optics Gran Turismo GT81 WIFD
William Optics Gran Turismo GT81 WIFD
William Optics Gran Turismo GT81 WIFD
William Optics Gran Turismo GT81 WIFD

William Optics Gran Turismo GT81 WIFD

£1,649.00
£1,899.00
(Inc. 20% VAT)
Loyalty Points: 1,649
In stock, Shipped in 1-2 working days

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Product Code
T-GT-81RD-WIFD
Brand
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William Optics
Description

William Optics Gran Turismo GT81 WIFD Internal Focus Design Telescope

THE NEW GAMECHANGER

Introducing the WILLIAM OPTICS Internal Focus Design (WIFD) Apochromatic Series. 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. 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.

NEW internal focuser.

Our new design includes the Patented WO centre focuser with precise internal sliding of fixed optics to prevent image shift. The integrated position viewing window on the focuser provides instant verification of the graduated numerical display. The smooth rack and pinion design is incorporated into the focuser to provide super fine adjustability for critical focus. The internal movement of the optical elements is protected from the elements and can’t come out of alignment. The redistribution of weight allows for better balance during imaging sessions.

 

The smooth rack and pinion design is incorporated into the focuser to provide super fine adjustability for critical focus. 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. The redistribution of weight allows for better balance during imaging sessions. Compatible with ZWO EAF. Also new Electric Rotator will be available in near future.

DESIGN PRINCIPLE

Scalable Design. The WIFD series will allow for many sizes and is not limited to smaller refractors. Additional optical designs are possible to meet various photographic requirements enhancing the line to include a number of apertures and fast focal ratios.

Inspired by the tremendous success of the WO CAT series of astrographs, William Optics has advanced the capabilities of astrophotography to the next level with this “no weight limit on photo accessories” design. The solid tube where accessories are attached, has a rigid design, and will not flex or exhibit any change in the optical path regardless of the weight of the camera and filter wheel attached to it.

CAT DESIGN

Improved “CAT” design ring tubes and dovetail base are lighter while remaining equally rigid. The new design allows for better balance with heavy accessories, and has integral placement of the focuser knobs, providing easy access to focusing during imaging. Included is the popular WO Saddle Bar Handle, critical for rigid guidescope mounting and autoguiding performance.

Super Smooth Field Rotator. Our field rotator design features smooth camera rotation with markings for degrees and a locking thumbscrew to prevent accidental camera movement, also new Electric Rotator will be available in near future.

Specifications:

  • Lens Type: Triplet Apochromatic Prime Lens
  • Focal Length: 478mm
  • Diameter: 81mm
  • F/ Ratio: f/5.9
  • Optional Flattener: FLAT6AIII 0.8x FLAT68III 1.0X (Require WIFD Extension Adapter)
  • Focuser: WIFD Compatible with EAF
  • Colour: Red
  • Lens Material: FPL-53
  • Strehl Ratio: 0.95+
  • Camera Format: Full Frame DSLR Mirrorless CMOS CCD
  • Test Report Included
  • T-Mounts Supported: Canon EF, RF Nikon F, Z Sony E Pentax K Micro Four Thirds (M4/3) FUJI X
  • OTA Weight: 7.3 lbs (3.3 kg)
  • Total Weight: 9.9 lbs (4.5 kgs)
  • Tube Length: (Retracted) 420mm
  • Tube Length: (Extended) 500mm

Recommended flatterers: Flat6aIII and FF68III.

Optional RotoLock is available.

Specifications

Specifications: William Optics Gran Turismo GT81 WIFD

Specifications: William Optics Gran Turismo GT81 WIFD Internal Focus Design Telescope

  • Lens Type: Triplet Apochromatic Prime Lens
  • Focal Length: 478mm
  • Diameter: 81mm
  • F/ Ratio: f/5.9
  • Optional Flattener: FLAT6AIII 0.8x FLAT68III 1.0X (Require WIFD Extension Adapter)
  • Focuser: WIFD Compatible with EAF
  • Colour: Red
  • Lens Material: FPL-53
  • Strehl Ratio: 0.95+
  • Camera Format: Full Frame DSLR Mirrorless CMOS CCD
  • Test Report Included
  • T-Mounts Supported: Canon EF, RF Nikon F, Z Sony E Pentax K Micro Four Thirds (M4/3) FUJI X
  • OTA Weight: 7.3 lbs (3.3 kg)
  • Total Weight: 9.9 lbs (4.5 kgs)
  • Tube Length: (Retracted) 420mm
  • Tube Length: (Extended) 500mm

What's in the Box

What's in the Box: William Optics Gran Turismo GT81 WIFD

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Delivery

At The Widescreen Centre, we prioritize prompt order processing and dispatch. We strive to dispatch all orders on the same day or the next working day, depending on the time of your order. We hold extensive stocks to ensure that your items are ready for immediate despatch. Please note that the cut-off time for same-day dispatch is usually 1:30 p.m.

For delivery within Mainland UK, we use reputable couriers to provide efficient service. You can expect your package to arrive in 1-2 working days. Please note that a signature may be required upon delivery to ensure a secure receipt.

In the case of special order items, the delivery time may be longer. If you have any concerns or questions about the delivery of your item, please don't hesitate to Contact Us. We are here to assist you.

Should there be any delay in dispatching your order, we will notify you to keep you informed.

Please be aware that The Widescreen Centre cannot be held responsible for any postal or third-party delays that may occur. We are committed to providing a reliable and efficient delivery service for our valued customers.

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