Dynaflect coated 6" Transmission Flat

Used it for an alignment test and the coated surface gave me clean fringes right out of the box. The 6-inch aperture is just right for my setup, and it holds its flatness well even after a few hours of use.

The 1/20 wave PV spec really shows when I checked the surface with my interferometer—fringes were clean and dead straight across the full aperture. Coating looks uniform with no streaks or pinholes, and the 6-inch size fits my setup without any adapter fuss. Exactly what I needed for a transmission

The coating on this 6" flat is noticeably more uniform than the bare one I'd been borrowing, and I didn't have to fight the mount to get it sitting right. Fringe patterns stayed clean right out to the edge, which is exactly what I needed for my setup.