a state where the battery voltage is insufficient for advancing film at a determined speed or where a manual winding mode is selected the control circuits for motor drive and shutter release control are activated in the motor drive mode in which the switch sw7 is closed the shutter release control circuit is composed of a release detecting circuit 50 and a second timer circuit 60 containing a selector circuit for selecting either continuous shooting or one frame shooting said release detecting circuit 50 is composed of a transistor q7 a stack of three diodes d7 and a diode d8 wherein said transistor q7 is turned on only when the release switch sw5 is closed during an h level output from a comparator a1 thereby turning on a transistor q8 connected parallel to the release switch sw2 of the camera through the terminals c d to transmit a release signal to the camera through the connector terminal c said release detecting circuit 50 is so structured that the voltage generated at the diode stack d14 at the closing of switch sw4 alone is excessively high for turning on the transistor q7 which therefore is turned on to provide the release signal only in response to the closing of the release switch sw5 the aforementioned second timer circuit 60 is composed of a comparator a1 a variable resistor r6 a condenser c4 a transistor q9 and a switch sw8 for selecting continuous exposure or one frame exposure in the continuous exposure mode in which the switch sw8 is opened the closing of the.