William Optics SpaceCat 51 APO 250mm f/4.9 (1.5 Generation)
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NOTE: SpaceCats will not be available for the foreseeable future. Currently, Redcats are the only model available.William Optics has temporarily discontinued the manufacture of them in order to keep up with the production of RedCats.
- Telescope Series: William Optics SpaceCat
- Optical Design: Refractor
- Refractor Design: Apochromat (APO)
- Number of Refractor Elements: 4
- Aperture: 2" (51mm)
- Focal Ratio: f/4.9
- Focal Length: 250mm
- Focuser Style: Helical
- OTA Length - Retracted: 8.3" (210mm)
- OTA Weight: 2.9lbs
- Image Circle Size: 44mm
From wildlife to the night sky, this 51 mm refractor from William Optics is the perfect companion for the traveling photographer and astronomer. With an aperture of 51mm, a focal length of 250mm and a fast f/4.9 focal ratio, it is lightweight and easy to transport!
The RedCat incorporates 48 mm threads and is compatible with a variety of wide T mounts. This magnificent little imaging scope also has a camera sensor tilt adjuster.
For visual use, you can also put a diagonal and eyepiece on the back for spectacularly sharp, high contrast images of both terrestrial and celestial targets. The RedCat mounts on any standard photographic tripod or an equatorial mount> The scope comes with a reversible base that has Arco-Swiss mounting on one side and a standard Vixen dovetail on the other.
The optics on this beauty are the best: Made of Ohara FPL53 & FPL51 synthetic fluorite glass for beautiful high contrast, spectacularly sharp results when used in both visual and photographic applications. APO performance means you’ll have virtually zero chromatic aberration. The Petzval design, which consists of four elements in three groups, also known as a Quad, produces a full frame flat field, with a image circle of 44mm.
The RedCat body is made of a strong aluminum alloy and is anodized a beautiful red for strength and durability. A matching dew/sun shield can be attached when needed and then inverted to store the lens without the additional length the dew shield provides. An aluminum threaded cap protects the optics whenever the RedCat is not in use.
In the middle of the RedCat 51, you will find a nicely designed ring mount that attaches to the reversible base and wraps securely around the body of the lens. A red anodized knob allows you to loosen the ring enough to fully rotate the RedCat 51, and it is also used to lock the ring in place. The “ring” has a flat section that has two 1/4-20 holes spaced far enough to allow the addition of a red dot finder, microphone, or other compatible accessories.
The helical focuser with a focusing index on the RedCat has a focus tension ring that allows you to lock focus or just increase or decrease the drag to your liking. A field rotator is included with this 250 mm lens as well.
Mosaics of large celestial objects or sections of the sky will be much easier.
A filter slot is built into the OTA just after the rotator and accepts 48 mm filters
Bahtinov Mask for focusing assistance during astrophotography
Soft carry case.
Front and rear Aluminum lens covers.
T mount not included