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
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.
Prime-lens telescope: corrector compatibility and spacing are model-specific. Optional correctors are listed, not assumed included; corrector adapters may be required.
Additional specifications
Flat6aiii spacing
60.2 mm backfocus; 5.2 mm adjustment
85984
Datasheet
Opening (mm)
81
Camera-adapters
M92 rotator; M92 to M63 adapter
Cameraformaat
Full frame, APS-C and Micro Four Thirds
Brandpuntsafstand (mm)
559
Openingsverhouding
6.9
Focuserslag (mm)
77
Type focuser
WIFD rack and pinion
Beeldcirkel (mm)
45
Door fabrikant genoemde correctors
Flat6AIII 0.8x
Montageplaat
Vixen / Arca-Swiss dual-sided
Optisch ontwerp
Doublet apochromat
Gewicht optische tubus (kg)
3.55
Totaalgewicht (kg)
4.56
Tubuslengte (mm)
526–607
Dit product gebruikt? Deel je ervaring met andere astronomen.
Commentaar (0)
Geen klantenbeoordelingen op het moment.
Uw beoordelingswaardering kan niet worden verzonden
Rapporteer reactie
Bent u zeker dat u deze opmerking wil rapporteren?
Melding verzonden
Uw opmerking is ingediend en zal door een beheerder worden behandeld.
Uw opmerking kan niet worden verzonden
Schrijf uw recensie
Beoordeling verstuurd
Uw beoordeling is toegevoegd en wordt beschikbaar zodra deze is goedgekeurd.
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
