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ISO 10157:1991
Photography -- Flash exposure meter -- Requirements
This International Standard applies to photoelectric flash exposure meters which measure the time integral of the luminance or of the illuminance of a photographic object (to be called thereafter “object”) illuminated by a source of light for a brief illumination period 1) and indicate the time integral or a number corresponding to the time integral or the f-number required for the correct exposure of a photographic film with a given speed.
Continuous light, which is available in addition to the light emitted by the flash light source, is also evaluated.
1) Within the range of gate time specified by the manufacturer for the specific meter.
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International Organization for Standardization [iso]
