Product model table
(Find the product number of the product you want in the form, and select the product number from the above options to purchase.）
| Material | BK7 |
| Dimension Tolerance | +0/-0.2mm |
| Thickness Tolerance | ±0.2mm |
| Surface Quality | 60/40 scratch and dig |
| Clear Aperture | >90% |
| Flatness | N<3(0.5)@632.8nm |
| Centration | <3 arc minutes |
| Focal Length Tolerance | ±2% |
| Chamfer | Protective <0.5mmx45° |
