|
Diameter
|
2--120mm
|
|
Diameter Tolerance
|
+/-0.05mm
|
|
Thickness Tolerance
|
+/-0.05mm
|
|
Focal Length Tolerance
|
+/-1%
|
|
Surface Accuracy
|
L/4 irregularity @632.8nm
|
|
Surface Quality
|
20-10 scratch-dig
|
|
Centration
|
<3 arc min
|
|
Clear Aperture
|
>90%
|
|
Bevel
|
Protective bevel
|
|
Material
|
BK7,Fused silica,SF11, and other optical glass
|
|
Coating
|
AR coating or BBAR
|
