International Organization for Standardization (ISO)
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ISO 6728:1983
Scope
Describes the spectral characteristics of an ISO standard camera lens and a method for determining the contribution of spectrally selective lenses to the colour of the final film image. The procedure can also be applied to other optical elements in the camera.
ISO 6728:1983 history
1983ISO 6728:1983 Photography; Camera lenses; Determination of ISO colour contribution index (ISO/CCI)