Specifications
Dia: 50.8
CT: 10.0
R1 Surface Flatness: 1/10 Wave
Specifications: Diameter (DIA): +-.18mm
Center Thickness (CT): +-.2mm
Cosmetics R1: 40/20
Surface Quality R1: See below @ 546.1nm
Surface Quality R2: Medium grind
Clear Aperture: 90% of surface area