Spherical Lenses
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 |