4" Corner Cube Retroreflector

I’ve been using this 4" corner cube to check my transmission flats regularly, and the bayonet interface locks in place confidently without any wobble. The retroreflector's precision is spot-on for aligning aperture converters too—just what I needed for consistent results.

The bayonet interface makes mounting this retroreflector quick and secure, and the corner-cube design snaps into alignment perfectly every time. It’s noticeably sturdier than other 4-inch reflectors I’ve handled.

Snapped this onto my alignment flat and the return beam came back dead center on the first try, no fiddling needed. The 4" aperture gives plenty of surface to work with when I'm squaring up a converter. Build feels solid enough that I'm not babying it in the shop.