| parameter | lens standard specification |
| material | glass, fused silica etc. |
| diameter | 2~180mm |
| diameter tolerance | /-0.01mm |
| decenter | 3' |
| flatness(in 25mm area) | n=3, △n=0.1 |
| surface quality | 40-20 |
| chamfer | c0.1mm, 45° |
| coating | ar film, reflection film, splitter film etc. |
* remark：customized is available | |