William Optics Red Cat61 - 61mm f/4.9 Petzval Refractor - T-C-61RD 60 mm Refractors 6 mm Field Stop Diameter:

6 mm Field Stop Diameter: 17

Bahtinov Cap

It can also be used for 1

This 25 mm eyepiece is a convenient focal length for observing many celestial objects including the Moon and planets

DAR127 and DAR152

William Optics Red Cat61 - 61mm f/4.9 Petzval Refractor - T-C-61RD 60 mm Refractors 6 mm Field Stop Diameter:The William Optics RedCat 61 f 4. 9 Petzval Refractor is a fast, portable quad refractor perfect for astrophotography. Its four elements are arranged in three groups, with FPL 53 glass used in the first group of two, followed by a single central element and a single rear lens that acts as a flattener. This quad optical system produces beautifully flat, high contrast images that are virtually free of chromatic aberration. The RedCat 61 Petzval