The William Optics RedCat refractor continues to be immensely popular, but if you'd like more aperture, a 71 mm f/4.9 RedCat is now available! This beautifully designed Petzval astrograph sports four optical elements in a three group configuration (2-1-1). The doublet front group is made of FPL-53 glass, followed by one central element and a rear lens. This optical design produces a flat image plane on its own, with an image circle of over 45 mm, without the need for a flattener. With an image circle this big, the RedCat 71 is compatible with full frame or APS-C sensors.
The William Optics Cat71 comes with a built-in Bahtinov mask to assist in focusing, and a calibrated helical focuser. The lockable helical focuser has a large surface area that makes it easy to focus, even with gloves. It's gear ring has 153 teeth, which is more precise than most camera lenses. Behind the focuser is a camera angle rotator with tension knob and a tilt adapter, which ends in M48 threads.
The RedCat 71 comes complete with a saddle handlebar on top. This handle accepts accessories such as a finder or guide scope but is raised above the focuser enough to serve as a carry handle. A pair of super sturdy mounting rings are also included and attach to an Arca Swiss/Vixen style plate, making it easy to connect the Cat71 to a telescope mount or heavy-duty camera tripod.
When you're not using your telescope, you can store it in the included soft carry bag!
Focal Length: 348 mm
Diameter: 71 mm
Focal Ratio: f/4.9
Image Circle: >44 mm
Focuser: Helical with 2GT Gear Ring
Tube Length with Dew Shield: 435 mm
Weight of OTA: 2.8kg / 6.2 lb.
Weight of OTA with Hardware: 3.7kg / 8.2 lb.