Warning system for automatic focusing camera

In an automatic focusing camera having a luminance detecting module for detecting the brightness of a scene to be photographed and for developing an electrical output signal representative of the scene brightness, a focus detecting module for detecting the condition of focus of the camera and for developing an electrical output signal representative of the condition of focus, and a camera shutter operating mechanism for opening and closing a camera shutter, wherein said camera shutter operating mechanism includes a manually operable release member which travels a certain distance in operation to actuate said camera shutter operating mechanism to initiate exposure and a single electromagnet for controlling termination of exposure, the combination comprising:

• means normally operative for preventing said manually operable release member from traveling the certain distance and thereby preventing actuation of said camera shutter operating mechanism;
• and means comprising said electromagnet, responsive to both the output signal of said focusing module when a focused condition is detected and the output signal of said luminance module when adequate scene brightness is detected, for disenabling said means for preventing said manually operable release member from traveling thereby permitting said manually operable release member to travel and actuate said shutter operating mechanism only when the camera is focused and the scene brightness is adequate.