OTA
William Optics RedCat 51 MK2.5
William Optics · RedCat 51 MK2.5 · 51mm quadruplet APO refractor telescope
Key specifications
| Aperture | 51 mm |
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| Focal length | 250 mm |
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| Focal ratio | f/4.9 |
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| Optical design | Quadruplet APO |
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| Weight | 1.3 kg |
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All specifications
| Focuser type | Helical |
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| Tube length | 228 mm |
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| Dovetail | Vixen |
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About
A 51 mm f/4.9 four-element Petzval astrograph needing no flattener, covering a 43 mm image circle. Uses a helical focuser and ships with a tilt adjuster, rotator and M54 to M48 adapter, on a dovetail that works as both Vixen and Arca-Swiss. Now discontinued.