International Organization for Standardization (ISO)
Latest
ISO 2827:1988
Scope
Specified are methods of measurements and standards of performance for light output, angle of coverage, ready indication, recycle time and number of flashes for electronic flash equipment of the single flash type, which is primarily intended to provide illumination for photography with cameras in which the contacts that control the flash are closed when the camera shutter is fully or nearly fully open.
ISO 2827:1988 history
1988ISO 2827:1988 Photography; electronic flash equipment; determination of light output and performance
1973ISO 2827:1973 Photography — Determination of the light output of electronic flash equipment