William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
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  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro
  • William Optics RedCat 91 WIFD 30th Anniversary Edition | PixelSkiesAstro

William Optics RedCat 91 WIFD 30th Anniversary Edition

€3,490.00
Tax included

William Optics RedCat 91 WIFD 30th Anniversary Edition A 91 mm Petzval astrograph with 448 mm focal length at f/4.9. The 55 mm image circle accompanies a five-element design using Super ED, ED and lanthanum glass.

Manufacturer model: William Optics RedCat 91 WIFD 30th Anniversary Edition · Specifications checked against manufacturer data on 2026-11-03

William Optics RedCat 91 WIFD 30th Anniversary Edition

A 91 mm Petzval astrograph with 448 mm focal length at f/4.9. The 55 mm image circle accompanies a five-element design using Super ED, ED and lanthanum glass.

Imaging and alignment

No separate field flattener is needed. WIFD rack-and-pinion focusing provides 36 mm travel. A sensor tilt adjuster and camera rotator support alignment and framing.

Camera and mount interfaces

M63 to M54; M63 to M48 adapters connect the camera train. Maximum listed backspacing is 60.8 mm through M48 or 65.8 mm through M54. The mounting plate uses Vixen-style profiles.

Dimensions

Tube length: 556 mm. OTA weight: 4.72 kg; total weight: 6.3 kg.

William Optics manufacturer specifications

Imaging application

This model is designed for astrophotography; William Optics states that its optical design does not support visual observing.

Compatibility notes

Anniversary edition source used. Maximum spacing depends on rear adapter; confirm reference surface and supplied edition.

Additional specifications

Maximum m48 backspacing (mm)60.8
Maximum m54 backspacing (mm)65.8
Focusing aidBahtinov mask integrated into front cover
92935

Data sheet

Aperture (mm)
91
Application
Astrophotography only; not designed for visual observing.
Camera adapters
M63 to M54; M63 to M48
External flattener required
No
Focal length (mm)
448
Focal ratio
4.9
Focuser travel (mm)
36
Focuser type
WIFD rack-and-pinion
Manufacturer image circle (mm)
55
Mounting plate
Vixen-style
Optical design
Five-element Advanced Petzval; two Super ED, one ED, one lanthanum and one X element
OTA weight (kg)
4.72
Sensor tilt adjustment
Tilt adjuster
Total weight (kg)
6.3
Tube length (mm)
556
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