ZenithStar 81 WIFD
William Optics
From ~$1,056.88
5 stores
The William Optics ZenithStar 81 WIFD is a premium doublet apochromatic refractor that combines exceptional optical precision with innovative engineering. Featuring the signature William Optics Internal Focus Design (WIFD), this 81mm telescope maintains perfect optical alignment even under the load of heavy cameras, making it an ideal choice for serious astrophotographers and visual observers alike. With FPL-53 extra low-dispersion glass elements and a compact, lightweight construction, the ZenithStar 81 WIFD delivers crisp, color-aberration-free images across its full focal length, while remaining highly portable for field work.
Astronomy Plus
ZenithStar 81 Doublet WIFD APO f/6.9
Worldwide shipping
CA$1,439.00
~$1,056.88
High Point Scientific
ZenithStar 81 APO Doublet Refractor with WIFD - Gold
Ships to US only
$1,098.00
Agena Astro
William Optics WIFD ZenithStar ZS81 81mm f/6.9 Apo Refractor OTA - Gold
Worldwide shipping
$1,098.00
First Light Optics
William Optics Zenithstar 81 APO WIFD
Worldwide shipping
£899.00
~$1,227.23
Astroshop.eu
Apochromatic refractor AP 81/559 ZenithStar 81 WIFD Gold OTA
Worldwide shipping
€1,290.00
~$1,531.33
Specifications
| Focal ratio | f/6.9 |
| Tube Length Retracted | 526 mm |
| Glass Material | FPL-53 (Synthetic Fluorite) |
| OTA Weight | 3.55 lb |
| EAF Compatible | ✓ |
| Aperture | 81 mm |
| Focuser Type | WIFD Internal Focus Design - 2.5 inch Rack & Pinion with 10:1 micro adjustment |
| Total Weight with Accessories | 4.56 kg |
| Lens Type | Doublet Apochromatic |
| Tube Length Extended | 607 mm |
| Camera Format Coverage | Full Frame |
| Focal length | 559 mm |
| Image Circle | 44 mm |
| Recommended Focal Ratio with Flat6AIII | f/5.5 |