A sequential shooting controller includes both high and low load drive modes, and first and second power-voltage detectors. The high/low load drive modes drive a device under high/low loads. The first power-voltage detector detects a power-voltage by connecting a load. The second power-voltage detector detects the voltage across the device. The first power-voltage detector is actuated at the beginning of sequential shooting before a first image capturing operation starts. The high load image capturing operation starts when the voltage detected by the first power-voltage detector is higher than a first threshold. The low load image capturing operation starts when the voltage detected by the first power-voltage detector is lower than the first threshold. The second power-voltage detector is driven during a high load image capturing operation. The second power-voltage detector is disabled during a low load image capturing operation.