Material: BK7or other optical materials
Dimension Tolerance: +0. 0~-0. 1mm
Center Thickness: +/-0. 2mm
Surface Quality: 60/40 Scratch/Dig
Surface Figure: lambda/2
Clear Aperture: >90%
Parallelism: <1 minute
Chamfer: 0. 25mm at 45 degree typical
Coating: Optional