Parameter

Standard Grade

Material

BK7 grade A optical glass

Clear Aperture

> 80%

Dimension Tolerance

+/-0.1mm

Angular Tolerance

+/- 5 arc min.

Parallelism

10 arc min.

Flatness

L/4 @632.8nm

Protective Bevel

0.25mmx45

Surface Quality:

60-40 S/D