OTA · MSRP $5,498
William Optics Ultra-Cat 131 · 30th Anniversary Limited Edition
Key specifications
| Aperture | 131 mm |
|---|---|
| Focal length | 648 mm |
| Focal ratio | f/4.9 |
| Optical design | Other |
| Weight | 11.3 kg |
All specifications
| Focuser type | WIFD rack-and-pinion, EAF compatible, 0-20 mm travel |
|---|---|
| Tube length | 650 mm |
| Dovetail | Losmandy |
About
A 131 mm f/4.9 five-element advanced Petzval astrograph needing no flattener, covering a 60 mm image circle. Built on the WIFD rack-and-pinion focuser with a sensor-tilt adjuster and rotator, on a Losmandy dovetail. This commemorative edition is limited to 30 individually numbered units with a laser-engraved emblem and the founder's signature.