Plano-Concave (PCV) lenses have one flat and one inward curved surface. PCV lenses have a negative focal length and are used for
image reduction or to spread light.
image reduction or to spread light.

| Diameter Tolerance | +0.0/-0.05mm | 
| Center Thickness Tolerance | ±0.02 mm | 
| Focal Length Tolerance | ±2% | 
| Surface Quality | 60/40, 40/20 or better | 
| Material | BK7, UVFused silica, Ge,Si,CaF2, ZnSe, | 
| Clear Aperture | >90% | 
| Centering | <3 arc min | 
| Coating | Custom | 
| Bevel | Protective bevel as needed | 












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