Material：Optical Glass, Quartz, BK7, CaF2, Sapphire, MgO, ZnS, Ge, Si, BaF2
Diameter Tolerance: -0. 00/-0. 15 mm
Thickness Tolerance: +/-0. 10 mm
Focus Length Tolerance: +/-1%
Centration: < 3arc minutes
Surface Quality: 20-10
Surface Figure: λ/4@633nm
Clear Aperture: Central 85% of diameter
Bevel: 0. 25mm x 45°