AEC/AGC Mode
AEC
AEC enables Automatic Exposure Control. In this mode, the optimal setting for exposure (shutter) is computed and updated for every frame. It may take several frames to adjust the shutter value to the correct setting. The current camera shutter parameter is updated at the end of the read cycle (see Camera Settings).
Note: The minimum (slowest) shutter setting will not exceed the frame read-out time of the current image dimension. For example, a full-size image has a minimum frame read-out time of 15 ms. Therefore, the slowest shutter that can be achieved is 15 ms, or 1/67.