كرة نقل F/5.4 - 6 بوصة - 1/20 موجة، PVr.

The surface quality on this 1/20 wave PVr sphere is exceptional — I noticed cleaner fringes on my first test than with my old reference. It's a solid upgrade for anyone doing precise interferometry.

I was really impressed with the smooth, even fringe pattern I got from this 6-inch sphere right out of the box. The 1/20 wave spec is clearly genuine, as my test setup showed almost no surface distortion. It's a solid upgrade for any precision optical bench.

The surface spec on this 6-inch sphere is right on the money; nulls came in beautifully clean on my interferometer. Took a bit to align the mounting threads, but once in place, it delivers flawless fringe patterns for testing.