William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro
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  • William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro
  • William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro
  • William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro
  • William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro
  • William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro
  • William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro
  • William Optics ZenithStar 81 WIFD Gold OTA | PixelSkiesAstro

William Optics ZenithStar 81 WIFD Gold OTA

€1,290.00
Tax included

William Optics ZenithStar 81 WIFD Gold OTA — 81 mm doublet apochromat This refractor provides a 559 mm focal length at f/6.9. The manufacturer lists a 45 mm image circle and optional correctors for photographic use.

Manufacturer model: William Optics ZenithStar 81 WIFD Gold OTA · Specifications checked against manufacturer data on 2026-11-03

Recommended compatible reducers & flatteners

William Optics Adjustable Flat6AIII Flattener/Reducer €299.00 View

William Optics ZenithStar 81 WIFD Gold OTA — 81 mm doublet apochromat

This refractor provides a 559 mm focal length at f/6.9. The manufacturer lists a 45 mm image circle and optional correctors for photographic use.

Focusing and camera connection

The WIFD rack and pinion focuser provides 77 mm travel. Connections comprise M92 rotator; M92 to M63 adapter.

Field correction

Manufacturer-listed options: Flat6AIII 0.8x. Each combination has a specific spacing and adapter arrangement; see the individual settings in the specifications. A corrector is an optional accessory.

Size and weight

Tube length is 526–607 mm and OTA weight is 3.55 kg. Total weight is 4.56 kg.

William Optics manufacturer manual

Compatibility notes

Prime-lens telescope: corrector compatibility and spacing are model-specific.

Additional specifications

Flat6aiii spacing60.2 mm backfocus; 5.2 mm adjustment
85984

Data sheet

Aperture (mm)
81
Camera adapters
M92 rotator; M92 to M63 adapter
Camera format
Full frame, APS-C and Micro Four Thirds
Focal length (mm)
559
Focal ratio
6.9
Focuser travel (mm)
77
Focuser type
WIFD rack and pinion
Image circle (mm)
45
Manufacturer listed correctors
Flat6AIII 0.8x
Mounting plate
Vixen / Arca-Swiss dual-sided
Optical design
Doublet apochromat
OTA weight (kg)
3.55
Total weight (kg)
4.56
Tube length (mm)
526–607
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