William Optics WIFD Gran Turismo 81 APO Refractor - Red
With the Patented Internal Focus Design (WIFD), the William Optics Gran Turismo 81 is a Game Changer!
The William Optics Gran Turismo 81 is an apochromatic triplet refractor with a unique (and patented!) focuser design. Unlike other focusers, the mechanism is internal to the tube of the scope, making it much more stable when cameras and other accessories are attached. This design also virtually eliminates vignetting!
The Gran Turismo 81 provides 81 mm of aperture. The optical configuration is a triplet design. The apochromatic glass is FPL-53. All of this combines to produce crisp, clean, high contrast, and sharp images without chromatic aberration. The focal length of the system is 478 mm, yielding a focal ratio of f/5.9.
A Technically Capable and Stylish Astrograph
In addition to the patented "William Optics Internal Focus Design" focuser, many high quality components and accessories are included. The red highlights provide a stylistic flourish to the scope. The triplet refractor design provides high quality optics in a triplet configuration. The included Bahtinov mask aids in achieving focus. The versatile tube rings with handle provides an easy way to carry the tube, as well as doubles as a shoe for the mounting of small accessories, such as a finder scope. In all, the William Optics Gran Turismo 81 is stylish, capable, and innovative astrograph!
Introducing the William Optics Internal Focus Design (WIFD)
This new focuser design includes the patented William Optics center 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 cannot come out of alignment. The redistribution of weight allows for better balance during imaging sessions.
Outstanding Optics
The Gran Turismo 81 features excellent optics to get the most out of your images. The optical assembly of this refractor is in a triplet configuration, made of FPL-53 apochromatic glass to reduce chromatic aberration and provide excellent contrast, color correction, and sharpness. As mentioned in more detail above, the unique internal focuser design slides otherwise fixed optics to prevent image shift and virtually eliminate vignetting.
Additional Accessories
The William Optics Gran Turismo 81 WIFD comes with several accessories to improve performance and convenience. The Rotolock field rotator allows for precise and convenient orientation of a connected camera. The Bahtinov mask aids in focusing. The optical tube rings and dovetail allow for easy mounting. The included handle doubles as a shoe for attaching small accessories, such as a finder scope. Lastly, a soft carrying case is included to make transportation a breeze!