William Optics Red Cat71 - RedCat 71 mm f/4.9 Refractor - T-C-71RD Astronomy Books or counter-clockwise to release the

or counter-clockwise to release the accessory

Optimized Optical Design: Explore 100 Degree Series hyper-wide eyepieces are optimized through each design

Zoom-lenses in general are not typically renowned for having high quality optics

Dimensions: 26

William Optics Red Cat71 - RedCat 71 mm f/4.9 Refractor - T-C-71RD Astronomy Books or counter-clockwise to release theHurry, just one left at an amazing price! The William Optics RedCat refractor continues to be immensely popular, but if you'd like more aperture, check out the 71 mm f 4. 9 RedCat! 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,