| Material | BK7, Fused Silica and other optical glasses |
| Dimension Tolerance | +0.0/-0.1mm |
| Clear Aperture | >90% |
| Angle Tolerance | Up to 10 arc seconds |
| Roof Angle Tolerance | Up to 5 arc seconds |
| Flatness | Up to λ/10@632.8nm |
| Surface Quality | Up to 20/10 scratch and dig |
