Shutter-Priority AETo adjust shutter speed manually while letting the camera select aperture for optimal exposure, rotate the auto mode selector lever to 
and set aperture to A and use the shutter speed dial.
S will appear in the display.
Shutter speed can also be adjusted in increments of 1/3 EV by pressing the command control left or right. Shutter speed can be adjusted even while the shutter button is pressed halfway.
If the correct exposure can not be achieved at the selected shutter speed, aperture will be displayed in red when the shutter button is pressed halfway. Adjust shutter speed until the correct exposure is achieved.
If the subject is outside the metering range of the camera, the aperture display will show “---”.
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