William Optics UltraCat 56 WIFD — 56 mm Petzval astrograph The 5-element optical system provides a 269 mm focal length at f/4.8, with a 50 mm image circle. Its Petzval design does not require an external field flattener.
Manufacturer model: William Optics UltraCat 56 WIFD · Specifications checked against manufacturer data on 2026-11-03
William Optics UltraCat 56 WIFD — 56 mm Petzval astrograph
The 5-element optical system provides a 269 mm focal length at f/4.8, with a 50 mm image circle. Its Petzval design does not require an external field flattener.
Focus and camera alignment
The WIFD rack-and-pinion focuser provides 30 mm travel and 1:10 fine adjustment. A camera rotator controls framing, while the Sensor Tilt Xterminator allows sensor alignment. The lens cover incorporates a Bahtinov focusing mask.
Imaging connections
STX tilt adjuster / rotator; interchangeable M68 to M48 and M68 to M54 adapters. Petzval focus depends on the complete camera train remaining within the telescope's focusing range.
Size and mounting
The tube length is 296.3–348.3 mm. OTA weight is 2.56 kg and the manufacturer specification table lists 3.21 kg total weight. The mounting plate is 210 mm Vixen-style / Arca-Swiss dual-sided.
William Optics specifies two Super ED elements, one ED element, one lanthanum element and one X-element in the five-element optical system. The internal focuser moves the focusing mechanism within the telescope, while the rear tilt and rotation adjustments support sensor alignment and framing.
Compatibility notes
Petzval focus range must accommodate the complete imaging train; do not interpret recommended camera spacing as an exact flattener backfocus. Confirm supplied adapters and revision.
88286
Technische Daten
Öffnung (mm)
56
Kameraadapter
STX tilt adjuster / rotator; interchangeable M68 to M48 and M68 to M54 adapters
Kameraformat
Full frame, APS-C and Micro Four Thirds
Kamerarotation
Camera angle rotator
Elektronischer Fokus
ZWO EAF compatible; use the manufacturer installation guide for the selected EAF model.
Externer Bildfeldebner erforderlich
No
Untersetzung Feinfokus
1:10
Brennweite (mm)
269
Öffnungsverhältnis
4.8
Okularauszug
WIFD rack-and-pinion
Auszugsweg (mm)
30
Fokussiermaske
Bahtinov mask incorporated in lens cover
Bildkreis (mm)
50
Linsenelemente
2 Super ED, 1 ED, 1 lanthanum and 1 X-element (5 elements total)
Montageplatte
210 mm Vixen-style / Arca-Swiss dual-sided
Optisches Design
5-element Petzval
Tubusgewicht (kg)
2.56
Sensor-Tilt-Einstellung
Sensor Tilt Xterminator
Gesamtgewicht (kg)
3.21
Tubuslänge (mm)
296.3–348.3
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William Optics UltraCat 56 WIFD — 56 mm Petzval astrograph The 5-element optical system provides a 269 mm focal length at f/4.8, with a 50 mm image circle. Its Petzval design does not require an external field flattener.
Manufacturer model: William Optics UltraCat 56 WIFD · Specifications checked against manufacturer data on 2026-11-03
