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
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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

Datasheet

Opening (mm)
91
Toepassing
Astrophotography only; not designed for visual observing.
Camera-adapters
M63 to M54; M63 to M48
Externe flattener vereist
No
Brandpuntsafstand (mm)
448
Openingsverhouding
4.9
Focuserslag (mm)
36
Type focuser
WIFD rack-and-pinion
Beeldcirkel volgens fabrikant (mm)
55
Montageplaat
Vixen-style
Optisch ontwerp
Five-element Advanced Petzval; two Super ED, one ED, one lanthanum and one X element
Gewicht optische tubus (kg)
4.72
Tiltafstelling sensor
Tilt adjuster
Totaalgewicht (kg)
6.3
Tubuslengte (mm)
556
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