Specifications:
Material: BK7 grade A
Dimension Tolerance: ± 0.1mm
Clear Aperture: 80% Dimensions
Surface Quality: 60-40
Surface Flatness: λ /4 @ 633nm for big surfaces
Surface Flatness: λ /4 @ 633nm for other surfaces
Angle Tolerance: 180° ± 5 arc seconds
Coasting: Aluminized and black paint on small surfaces
Bevel: 0.3mm ± 0.1mm