| SPECIFICATION | |
| Material | BK7 grade A optical glass or UV Fused Silica |
| Dimension Tolerance | ±0.03-0.15 |
| Angle Tolerance | 3'-5' |
| Parallelism | 5'-10' |
| Surface Quality | 60-40/40-20 scratch and dig |
| Aperture | 0.5-2 |
| Irregularity | 0.2-0.5 |
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