Material BK7 Grade A Optical Glass
Dimension Tolerance +0.0,-0.2mm
Clear Aperture >80%
Deviation 180°+/- 3 arc seconds
Flatness λ/4 on big surface, λ/10 on Other Surfaces
Surface Quality 60/40 scratch/dig
Wavefront Distortion λ/2@633nm
Bevel 0.2mm to 0.5mm
Coating on Input and Output Surface Uncoated