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In aperture-priority AE (mode A), you select the aperture and let the camera choose the shutter speed.
Rotate the command dial to choose the aperture.
If the correct exposure can not be achieved at the selected aperture, the shutter speed will be displayed in red when the shutter button is pressed halfway. Adjust aperture until the correct exposure is achieved.
If the subject is outside the metering range of the camera, the shutter speed display will show “– – –”.