Canon 5D Mark III User Manual (en)

Basic Operation
Turn the dial while holding down 
the lock release button at the 
center of the dial.
(1) After pressing a button, turn the 
<6> 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 <6> dial to set the desired 
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 
metering mode, AF mode, ISO 
speed, AF point, etc.
(2) Turn the <6> dial only.
While looking at the viewfinder or LCD 
panel, turn the <6> dial to set the 
desired setting.
Use this dial to set the shutter speed, 
aperture, etc.
Mode Dial
 Main Dial
The operations in (1) are also possible while the <R> switch is set to 
the right (Multi function lock, p.47).