| parameter | small lens standard specification |
| material | glass, fused silica etc. |
| diameter | mini.1.5mm |
| diameter tolerance | /-0.003mm |
| decenter | 40″ |
| flatness(in 25mmarea) | n=3, △n=0.1 |
| surface quality | 20-10 |
| coating | ar film, reflection film, splitter film etc. |
* remark：customized is available | |