Improvements in or relating to electrical flash units for use with cameras with electrical shutters

摘要

An electronic flash unit for use with a camera with an electrical shutter from which an illumination control signal is derived when a shutter closing operation is initiated, has a flash ready detector circuit associated with a main capacitor for discharge through a flash discharge tube and providing a signal for onward transmission to camera in which it is used to enable a gate circuit which permits passage of an illumination control signal for transmission back to the flash unit to effect interruption of flashing of the flash discharge tube.