1) Material: optical glass, fused silica, CaF2, etc.

2) Size: 2mm~300mm

3) Focal Length: +/-4mm~+/-5000mm

4) Surface Quality: 60-40, 40/20 or 20/10 scratch and dig

5) Centration: < 3 arc minutes

6) Clear Aperture: > 90%

7) Chamfer 0. 25mm at 45 degree typical

8) Coating: AR coating or Customer design