Spherical lenses can be ground and polished to customer specifications for all materials in the CDGM Glass Catalog.
The following table provides standard and precision quality specifications:
| Feature |
Standard Quality |
Precision Quality |
| Center Thickness |
±0.02 mm |
±0.01 mm |
| Diameter |
+0/-0.02 mm |
+0/-0.005 mm |
Surface Deviation
Power – Irregularity |
3 – 1 (fringes) |
Precision
1 - 1/4 (fringes) |
Ultra Precision
.1 – 1/10 (fringes) |
| ETD |
0.05 mm |
0.01 mm |
| Scratch - Dig |
60 - 40 |
20 – 10 |
| AR Coating – |
Single Layer R<1.5% per side* |
Multi Layer R<0.5% per side* |
| Sag |
+/- .015 mm |
+/- .010 mm
|