4-inch transmissiebol (6024-0410-13)

Setup was straightforward on our interferometer, and the 4-inch aperture gave us clean, repeatable measurements right away. The F/10.7 spec matched perfectly for the optical testing we’re doing.

The wavefront on this F/10.7 sphere is clean and consistent across the full 4-inch aperture, which made aligning our interferometer setup noticeably easier. For the price, the build quality feels solid and the housing is machined precisely. My only tiny gripe is the lack of a scratch-free shipping c

Swapped this onto our interferometer for a batch of concave surface measurements and the fringe pattern was clean right out of the case. The 4-inch clear aperture covers our mid-size optics without repositioning, which saves a ton of setup time. Alignment held steady through a full day of testing.