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English
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Double-Concave Lenses have two inward curved surfaces and a negative focal length. They are used for image reduction and to spread light..
Common specification:
| Typical Material | BK7,Fused Silica |
| Typical Dimension（mm) | 3~130 |
| Diameter Tolerance(mm) | +0.00/-0.02 |
| Focus Length Tolerance(%) | +/-2% |
| Centration(arc min) | <3 |
| Irregularity (P-V) @ 632.8nm | 1/4 |
| Power (P-V) @ 632.8nm | λ |
| Surface Quality(scratch/dig) | 40-20 |
| Bevel | Protective bevel as needed |
| Coating | As request |
Double-Concave Lenses have two inward curved surfaces and a negative focal length. They are used for image reduction and to spread light..
Common specification:
| Typical Material | BK7,Fused Silica |
| Typical Dimension（mm) | 3~130 |
| Diameter Tolerance(mm) | +0.00/-0.02 |
| Focus Length Tolerance(%) | +/-2% |
| Centration(arc min) | <3 |
| Irregularity (P-V) @ 632.8nm | 1/4 |
| Power (P-V) @ 632.8nm | λ |
| Surface Quality(scratch/dig) | 40-20 |
| Bevel | Protective bevel as needed |
| Coating | As request |
