Diameter Available 1.5mm – 200mm

Diameter |Tolerance 0/-0.02mm

Thickness Tolerance /-0.02mm

Focal Length Tolerance /-1%

Surface Accuracy L/4 irregularity @632.8nm

Surface Quality 20-10 SD

Centration <3 arc min

Clear Aperture >90%

Bevel   Protective bevel

Material BK7, 

AR coating and BBAR