Material | |
Spherical Configuration | Plano-convex, Plano-concave, Convex-concave, |
Diameter Tolerance | +/- 0.1 mm |
Thickness Tolerance | +/- 0.1 mm |
Centration | 5 arc min |
Focal length tolerance | +/- 2% |
Scratch - Dig | 60-40 or upon customer's request down to 10-5 |
Clear aperture | 80 - 90% |
