4" Transmission Sphere F/.75

The wavefront error spec of 1/20 PV really shows up in the data—my measurements are cleaner than anything I’ve gotten from cheaper spheres. Setup was straightforward, and the f/0.75 aperture gives me the coverage I need for fast optics without swapping components mid-test.

The f/0.75 aperture on this transmission sphere is a game-changer for testing fast optics—my measurements came back clean and repeatable right out of the box. I’ve been using it with my interferometer setup for a week now, and the 1/20 wave PV figure holds up exactly as claimed. It’s pricey, but the

The 1/20 wave PV spec on this sphere is no joke — our fringe pattern cleaned up noticeably compared to the old accessory we'd been limping along with. Fits our interferometer mount fine and the surface looked spotless right out of the case.