Canon 5D Mark III User Manual (en)

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You can select the AF mode to suit the shooting conditions or subject. 
In the <
A> mode, “AI Focus AF” is set automatically.
1
On the lens, set the focus mode 
switch to <AF>.
2
Press the <o> button. 
(9)
3
Select the AF mode.
 
While looking at the LCD panel, turn 
the <6> dial.
X
: One-Shot AF
9
: AI Focus AF
Z
: AI Servo AF
Suited for still subjects. When you press the shutter button 
halfway, the camera will focus only once.
 
When focus is achieved, the AF point that achieved focus will be 
displayed, and the focus confirmation light <o> in the viewfinder will 
also light up.
 
With evaluative metering, the exposure setting will be set at the 
same time focus is achieved.
 
While you hold down the shutter button halfway, the focus will be 
locked. You can then recompose the shot if desired.
f
: Selecting the AF ModeN
One-Shot AF for Still Subjects
In the d/s/f/a/F shooting modes, AF is also possible by pressing 
the <p> button.