RedCat 51 II Petzval APO
William Optics
Lightweight, fast (f/4.9), and sharp Petzval apochromatic refractor with a 250mm focal length and built-in filter adapter, field rotator and a Bahtinov mask.
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Specifications
| Aperture | 51mm |
| Focal ratio | f/4.9 |
| Coating | multiple |
| Focal length | 250mm |
| Highest magnification | 102 |
| Optical design | Petzval |
| Optics type | Refractor |