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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