Plano Concave Lenses
Lens Specifications
| Material | BK7,B270,Quartz, Borosilicate glass, Optical glass, Customer-designated materials |
| Diameter | 2mm~1000mm |
| Radius | specified by customer |
| Chamfer | specified by customer |
| Coating | specified by customer |
| Low grade | General grade | High grade | |
| Diameter tolerance | +/-0.2 | 0 | 0 |
| Surface quality | 120-80 | 60-40、80-50 | 10-5、20-10、40-20 |
| Parallelism | 3’ | 1’ | 10’’ |
| Surface accuracy | 2λ | 1/2λ | 1/10λ |
| Radius tolerance(ΔR) | R/300 | R/500 | R/1000 |
| Central Thickness(Tc) | +/-0.1 | +/-0.05mm | +/-0.01 |
| Edge Thickness(Te) | +/-0.1 | +/-0.05mm | +/-0.01 |
| Clear Aperture | 0.85 | 0.9 | 1 |
| Centration | 5' | 3' | 30'' |
