PURPOSE: To prevent a current from being wasted by allowing an automatic focus adjusting circuit to decide whether a photographic lens is set at a focusing position properly or not and stopping latch operation by a reset circuit unless the photographic lens is set properly.

CONSTITUTION: A current corresponding to subject brightness flows to transistors TR6 and TR7 similarly and this current flows to a resistance R11 as well, thereby judging low brightness, proper exposure, or high brightness from the extent of the voltage drop across the resistance R11. When the brightness is low, the output level of an IC3 drops to 0 and an LED1 turns on. The reset circuit which stops the latch operation of a latch circuit in said state is provided to prevent the current from being wasted by the automatic focus adjusting circuit.