by the camera operator powers up the camera and through a logic sequence as later explained triggers each of the operation units into operation at an appropriate point in the camera cycle a conventional latching arrangement not shown is employed in conjunction with the camera button 64 to maintain camera operation throughout the complete cycle the latch being activated with initial button operation and released upon the operation of the final event in the cycle in the illustrated circuit actuation of the button 64 initiates energization of a strobe charging network 82 which when fully charged enables the strobe unit 72 for subsequent firing during charging of the charging network 82 operation of other components is inhibited by appropriate logic circuitry designated by a range inhibit circuit 84 and an exposure inhibit network 86 the latter networks may be provided by any suitable means such as a flip flop circuitry or conventional logic arrangements wherein network 84 clamps or holds the sonic range network 58 inoperative until strobe charging is complete and network 86 holds the shutter system inoperative until both strobe charging and subject ranging is complete consequently in this arrangement during strobe charging the inhibit networks 84 and 86 are active due to a 34 charging 34 signal on lines 88 and 90 when charging ceases the range inhibit network 84 is released which in turn triggers the sonic range network 58 into operation activation of the exposure inhibit network continues however due to a 34 ranging 34 signal presented on line 92 upon activation the sonic range network 58.