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Classification: 43020400 [AFX578003]
| Preferred name | 43-02-04 滤光片（光学元件） |
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| Definition | Regularly transmitting device used to modify the radiant or luminous flux, the relative spectral distribution, or both, of the radiation passing through it. A distinction is made between selective filters and non-selective filters or neutral filters or neutral grey filters according as they do or do not alter the relative spectral distribution of the radiation. A selective filter that makes a significant change in the chromaticity of the radiation is called a coloured filter, one that alters the spectral distribution but, because of metamerism, transmits radiation of nearly the same chromaticity as that of the incident radiation, may be called a grey filter. Delineation to segment 19, 27 see note |
| IRDI | 0173-1#01-AFX578#003 |
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