Quadruplet with field rotator: more openness, more detail
The William Optics RedCat 61 The Cat-concept moves to a 61 mm aperture and 300 mm focal length. The quadruplet optics provide a bright, sharp, and flat image across the entire frame, and the built-in field rotator precisely positions your composition without disturbing the focus.
Made for serious deep-sky compositions
The Petzval design with integrated corrector keeps stars round all the way to the corners of a full-frame sensor. At f/4.9, exposures remain short and noise low. The included tube rings and Arca/Vixen dovetail provide a stable, flex-free mount for camera and guidescope.
In the box
- RedCat 61/300 Optical Tube with Integrated Corrector
- Field rotator
- Tube Rings
- Arca-Swiss & Vixen-Style Prism Rail
- Bahtinov mask
- Nylon tote bag
Featured accessories
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 deep-sky photographers making the leap from a 51mm refractor to more aperture and scale, while maintaining portability. Not for those primarily seeking maximum sky fields; the MiniCat or RedCat 51 remains the specialist for that.
Specifications
| Optical design | Apochromat, quadruplet Petzval with corrector |
| Opening | 61 mm |
| Focal length | 300 mm |
| Opening ratio | f/4,9 |
| Field rotator | Built-in |
| Field of view | Flat to full-frame |
| Attachment | Mounting rings with Arca/Vixen prism rail |
| 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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