William Optics Red Cat61 - 61mm f/4.9 Petzval Refractor - T-C-61RD 60 mm Refractors mechanical and ergonomic improvements throughout

mechanical and ergonomic improvements throughout make the mount sturdier

It can also be used for 1

Bahtinov Cap

M48 threads (not standard T-thread)

XX Illuminated Glass Reticle

William Optics Red Cat61 - 61mm f/4.9 Petzval Refractor - T-C-61RD 60 mm Refractors mechanical and ergonomic improvements throughoutThe 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