类型
带通滤光片，二向色滤光片、中性密度滤光片
材料
SCHOTT,CDGM,OHARA,HOYA,熔石英等光学玻璃材料
| Specification | Normal | Precision |
| Optical Density | 4.0 (average) | 6.0 (average) |
| Blocking Wavelengh Range | 400nm-1000nm | 200nm-2000nm |
| Surface Flatness | λ/1@632.8nm | λ/10@632.8nm |
| Clear Apeture | >90% | >100% |
| Surface Quality | 60-40 S/D | 20-10 S/D |
