ZenithStar 81 with internal focuser: gold on the tracker
The William Optics ZenithStar 81 WIFD Gold combines an 81mm FPL-53 doublet with the internal WIFD focuser. Light enough for a Star Adventurer or star tracker, powerful enough for serious deep-sky astrophotography: you'll be ready to shoot or observe in minutes.
Sharp to the edge, stable under camera weight
The FPL-53 doublet keeps colors tight together, and the 559mm focal length (f/6.9) provides a nice scale for nebulae and galaxies. The internal WIFD focuser doesn't move weight outside the tube: balance remains stable, and heavy camera setups don't sag. A Bahtinov mask and adapters are included.
In the box
- ZenithStar 81/559 Optical Tube with WIFD Focuser, Gold Edition
- Tube Rings
- Arca-Swiss and Vixen-Style dovetail
- Handle
- Bahtinov mask
- Adapters
- Soft carrier bag
Featured accessories
The William Optics Flat6A III Adjustable Flattener-Reducer (289 euros) flattens the field to full-frame; the UniGuide 32mm guidescope (159 euros) enables long exposures.
For whom yes, for whom no
For: astrophotographers looking for a lightweight 81mm APO with an internal focuser, in gold finish with a sharp price advantage. Not for: those who want an integrated Petzval system without a separate flattener; look at the Cat series instead.
Specifications
| Optical design | Apochromat, FPL-53 doublet |
| Opening | 81 millimeters |
| Focal length | 559 mm |
| Opening ratio | f/6,9 |
| Focuser | WIFD (intern) |
| Focus assist | Bahtinov mask |
| Attachment | Mounting rings with Arca-Swiss and Vixen-Style dovetail and handle |
| Execution | OTA (loose tube), Gold |
Unsure about the right tube for your camera and mount? The telescope selection aid helps you choose. Also view all Refracting telescopes and the full range of William Optics.
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