Canon EOS 5D Mark III Instruction Manual (en)

Basic Operation
(1) After pressing a button, turn the 
<5> dial.
When you press a button such as <n> 
<o> <m>, the respective function 
remains selected for 6 seconds (9). During this time, 
you can turn the <5> dial to set the desired setting.
When the function selection ends or if you press the 
shutter button halfway, the camera will be ready to shoot.
Use this dial to select or set the white 
balance, drive mode, flash exposure 
compensation, AF point, etc.
(2) Turn the <5> dial only.
While looking at the viewfinder or LCD panel, 
turn the <
> dial to set the desired setting.
Use this dial to set the exposure 
compensation amount, the aperture 
setting for manual exposures, etc.
During movie shooting, the touch pad provides a quiet way to adjust the 
shutter speed, aperture, ISO speed, exposure compensation, sound 
recording level, and headphone volume (p.238). This function works 
when [z5: Silent Control] is set to [Enable h].
After pressing the <Q> button, 
tap the <
5> dial’s inner ring at 
the top, bottom, left, or right.
 Quick Control Dial
h Touch Pad
The operations in (1) are also possible while the  <R> switch is set to 
the right (Multi function lock, p.47).