23 Jun 2011
Diameter Available 1.5mm--200mm Diameter Tolerance +0/-0.05mm Thickness Tolerance +/-0.05mm Focal Length Tolerance ±1% Surface Accuracy 入/4 irregularity @632.8nm Surface Quality 40-20 S/D Centration <3 arc min Clear Aperture >90% Bevel Protective bevel Material BK7, Fused silica, and other optical glass Coating AR coating