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Standard´s number: | ISO 4851:1979 |
Pages: | 2 |
Edition: | 1 |
Released: | 1979 |
Language: | English |
DESCRIPTION
ISO 4851:1979
Gives the numbering of and transmittance requirements for filters. It defines guidance and their selection and use. Optical test methods form the subject of ISO 4854. Non-optical test methods form the subject of ISO 4855. The symbol for filters includes a code number and the shade number corresponding to the filter. The determination of transmittance is described in clause 5 of ISO 4854.