William Optics Red Cat71 WIFD

William Optics RedCat WIFD 71 f/4.9 APO Astrograph Refractor

This William Optics WIFD 71 mm APO Astrograph is a premier tool for astrophotographers. The RedCat WIFD 71 provides color-free apochromatic performance. With 4 elements in 3 groups (2-1-1- configuration), the 71 mm RedCat Petzval refractor is designed with a doublet made of FPL-53 glass up front, a single central element, and a single rear lens to provide a flat image plane without any need for an additional flattener.

William Optics designed this refractor with excellent color correction and pinpoint stars, even at the edge of the 45 mm image circle.

Bahtinov Mask

Included with this William Optics RedCat telescope is a Bahtinov focusing mask. The Bahtinov mask is a great tool for astrophotography and modifying focus. With William Optics quality, the Innovative Bahtinov Mask Cover will help astrophotographers reach the best focus when capturing those wonderful celestial photos.

Patented WIFD Focuser

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.

Other Included Accessories

William Optics has included the following accessories:

• Camera Angle Rotator

• Tilt Adapter

• Saddle Handlebar (with two M4 thumb screws)

• 21 cm Arca Swiss/Vixen Plate

• Mounting Rings

• Dew Shield

• Threaded Dust Cap

• Soft Carry Bag

OTA Aesthetics

The William Optics RedCat has a premium quality anodized red finish. The OTA also has black accents with white "cat" accents, such as paw decals on the OTA, cat ears cut into the rings, and a cat face on the dust cap and handle.

Please note that the RedCat WIFD 71 was designed for astro-imaging and cannot be used visually.

William Optics RedCat WIFD 71mm Refractor Technical Features

• Telescope Series: William Optics RedCat

• Optical Design: Refractor

• Refractor Design: Apochromat (APO)

• Aperture: 2.8" (71 mm)

• Focal Ratio: f/4.9

• Focal Length: 348 mm

• Image Circle: >45 mm

• Focuser Style: William Optics Patented WIFD

• OTA Length: 16.81" (427 mm)

• OTA Weight: 7.11 lb.

• OTA Weight with ring, dovetail, and saddle: 9.47 lb.