Specifications:
Dimensional Tolerance: +/- 0.1mm
Diameter Tolerance: +0/-0.1mm
Transmitted Wavefront Error: ¼ wave
Scratch/Dig: 60/40
Optical Density Tolerance (@550nm):
0.1-0.9 OD better than +/- 0.05 OD
1.0-1.9 OD better than +/- 0.10 OD
2.0-4.0 OD better than +/-0.15 OD