Exposure control device for a single lens reflex camera

An exposure control system for a single lens reflex camera having a shutter release operation and an objective lens, comprising:

• a diaphragm device having an adjustable aperture;
• means for adjusting the diaphragm aperture of said diaphragm device, said aperture adjusting means starting its action with initiation of shutter release operation of said camera;
• an exposure control device including:
• a photosensitive element for sensing the light passed through the objective lens and diaphragm device at the maximum diaphragm aperture, said element for converting the light passing through the objective lens into an electric signal,
• means for memorizing the electric signal provided by said photosensitive element, and
• means for regenerating the electric signal memorized in said memory means;
• a shutter speed setting means capable of being selectively adjusted manually for setting shutter speed;
• means responsive to said regeneration means for setting a first level, said level setting means being set to the value corresponding to the adjusted value of said shutter speed setting means;
• means for setting a second level, said means being set to a value corresponding to the adjusted amount of said aperture adjusting means;
• means for finally determining the diaphragm aperture, said means including means for comparing the output level of said first level setting means with that of said second level setting means;
• means responsive to said comparison means for locking said aperture adjusting means after being finally determined by said final determining means;
• shutter control means responsive to said regenerative means;
• and
• means for changing the connection of the regenerative means to the shutter control means from the first level setting means in association with the action of said locking means.