November 18, 2017



Refer to Zemax for a newly updated and comprehensive CDGM folder

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