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| 31. | fixed neutral density filter |
| 固定中密度滤光器 |
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| 32. | infra-red transmitting filter |
| 红外透射滤光器 |
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| 33. | colour temperature conversion filter |
| 色温交换滤光器 |
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| 34. | filter-grating infrared spectrometer |
| 滤光器-光栅红外光谱仪 |
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| 35. | dichroic filter |
| 二向色滤光器 |
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| 36. | tunable birefringent filter |
| 可调谐双折射滤光器 |
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| 37. | Christiansen filter |
| 克里斯琴森滤光器 |
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| 38. | colour reversible electrochemical filter |
| 彩色可逆电化学滤光器 |
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| 39. | selective filter |
| 选择滤波器；选择性滤光器 |
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| 40. | tical channel-dropping filter |
| 光通道衰减滤光器 |
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