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°