Cylindrical Concave Lens

Focal Length Tolerance /-1%

Surface Accuracy 0.5 fringes per cm

Length/width/thickness /-0.1mm 

Surface Quality 40-20 SD

Centration <3 arc min

Clear Aperture >90%

Bevel   Protective bevel

Material BK7, Fused Silica and other optical glass

AR coating and BBAR