The same Cat optics in its own design
The William Optics SpaceCat 51 WIFD It shares its optical heart with the RedCat 51: the same fast f/4.9 Petzval system, the same internal WIFD focuser, but in the distinctive SpaceCat version. You get a bright, flat image that remains sharp all the way to the corners, even on full-frame.
Ready for the tracker
The Petzval design makes a separate flattener redundant, so your setup stays light and simple: tube, camera, tracker, done. The Arca-Swiss/Vixen dovetail bar fits directly onto photo tripods and star trackers, and the integrated Bahtinov mask makes focusing exact and fast.
In the box
- SpaceCat 51/250 optical tube with WIFD focuser
- Integrated Bahtinov mask
- Arca-Swiss & Vixen-Style Prism Rail
- Nylon tote bag
Featured accessories
With the William Optics 90 degree zenith prism (version for the Cat 51 WIFD) the SpaceCat can also be used visually. A William Optics UniGuide 32mm Guidescope (159 euros) completes the setup for long exposures. William Optics' M48 camera adapters are available for common mounts; choose the variant for your camera.
For whom yes, for whom no
For: astrophotographers who want the proven Cat 51 optics and prefer the SpaceCat version's aesthetics or appreciate the price advantage. Not: those looking for a longer focal length for smaller objects; the RedCat 71 or Cat 91 class provides a larger image scale.
Specifications
| Optical design | Apochromat, four-lens Petzval (FPL53 and FPL51) |
| Opening | 51 mm |
| Focal length | 250 mm |
| Opening ratio | f/4,9 |
| Focuser | WIFD (intern) |
| Field of view | Flat to full-frame |
| Focus assist | Integrated Bahtinov mask |
| Attachment | Arca-Swiss and Vixen-Style |
| Execution | OTA (loose tube) |
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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