To prevent temporary reduction of battery voltage when driving a shutter,
an exposure control drive apparatus is provided with a boosting circuit
for boosting a voltage of the battery and outputting a boosted voltage. A
capacitor is charged by the boosted voltage for driving an actuator of an
exposure control mechanism. A detecting circuit detects a current flowing
in the boosting circuit and a control circuit controls operation of the
boosting circuit in accordance with a magnitude of the detected value so
that the boosting circuit is prevented from boosting the battery voltage
when the detected current exceeds a predetermined level and is permitted
to boost the battery voltage when the detected current is below the
predetermined level. In this manner, the current flowing from the battery
is prevented from exceeding a maximum level.