Double-Concave (DCV) Lenses have two inward curved surfaces and a negative focal length. They are used for image reduction and to spread light.
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Diameter Tolerance | +0.0/-0.05mm |
Center Thickness Tolerance | ±0.2mm |
Focal Length Tolerance | ±2% |
Surface Quality | 60/40, 40/20 or better.. |
Material | BK7/K9, Fused silica |
Clear Aperture | >90% |
Centering | <1 arc min |
Coating | Custom |
Bevel | Protective bevel as needed |