Material: N-BK7,
Surface Quality: 40-20
Dimension Tolerance:+0.0, -0.2mm,
Angle Tolerance: ±5 arc sec(Standard); ±3 arc sec(High Precision)
Clear Aperture: >85% of dimension
Flatness: lambda/4 on front surface,lambda/8 on reflective surfaces
Deviation 180°: ±5 arc sec(Standard); ±3 arc sec(High Precision)
Bevel: <0.25mm X 45°
Coating:
1.Uncoated
2.Silver+ Black paint on reflective surfaces