Specifications
Diameter (mm): 50.8
CT (mm): 10.0
Specifications: Diameter: +0/-.18
Center Thickness (CT): +/- .2
Cosmetics: 60/40
Surface Flatness: 1/10 wave @ 632.8nm
Parallelism: 30 arc seconds
Clear Aperture: 90% of diameter
All dimensions are in millimeters.