33mm Dynaflect Transmission Flat

The 1/20 wave PV specification is incredibly precise, and the coating on this flat looks flawless under inspection. It’s made a noticeable difference in the clarity of my interferometer readings.

Checked the flatness against a reference and the 1/20 wave PV spec is spot on—interference fringes were beautifully straight across the full 33mm aperture. It’s cleaned up my interferometer alignment work noticeably, no complaints.

The 1/20 wave spec really shows up in the fringes — clean and straight across the whole 33mm aperture. I've been using it in our interferometer setup for a few weeks now and it hasn't needed any adjustment. Nice piece of glass for the price.