| Material |
BK7 Grade A Fine Annealed |
| Dimensions |
MM |
| Diameter Tolerance |
+ 0 / -0.10 mm |
| Thickness Tolerance |
±0.10 mm |
| Clear Aperture |
90% |
| Surface Quality |
40-20 Scratch-Dig |
| Parallelism |
< 30 Arc Seconds |
| Coating |
Uncoated (See Coating Chart for Available Options) |
| * All dimensions are in mm |
