International Organization for Standardization (ISO)
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ISO 5763:1989
Scope
Specifies the methods for measuring the characteristics peculiar to the control such as accuracy and repeatability. Also lays down the numerical values of the integral of time of the object luminance and of the exposure given to an object by flash equipment with automatic exposure control, and the maximum deviation from these nominal values.
ISO 5763:1989 history
1989ISO 5763:1989 Photography; electronic flash equipment; automatic control of exposure
1982ISO 5763:1982 Photography — Electronic flash equipment — Automatic control of exposure