Material | JGS1,K9,BK7,B270,SF11,CaF2,sapphire,ruby,fused silica,etc. |
Dimension tolerance | +/-0.0, +/-0.1mm |
Center thickness | +/-0.2mm |
Bevle | <0.25mm |
Paraxial focal length | +/-1% (EFL<1m) |
+/-2%(EFL>1m) | |
Surface quality | 60-40 scrath and dig |
Clear aperture | Central 85% of diameter |
Coating | Uncoated, AR, HR, PR coating, etc. |