Canon 5D Mark III User Manual (en)

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111
When Autofocus Fails
1
Set the lens focus mode switch to 
<MF>.
X
<4 L> will be displayed on the 
LCD panel.
2
Focus the subject.
 
Focus by turning the lens focusing 
ring until the subject looks sharp in 
the viewfinder.
MF: Manual Focusing
Focusing ring
 
When you press the shutter button halfway while focusing manually, the 
focus confirmation light <o> will light up when focus is achieved.
 
With 61-point automatic selection, when the center AF point achieves 
focus, the focus confirmation light <o> will light up.