Canon 5D Mark III User Manual (en)

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3
 Customizing AF FunctionsN
: Manual select.:Zone AF
The 61 AF points are divided into nine zones for focusing.
: Auto selection: 61 pt AF
All of the AF points are used for focusing.
You can set the method for changing the AF area selection mode.
 
 M-Fn button
After you press the <S> button, each 
time you press the <B> button, the 
AF area selection mode changes.
 
 Main Dial
After you press the <S> button, turning 
the <6> dial changes the AF area 
selection mode.
AF area selection method
 
The <X> mark cannot be deleted from [Manual selection:1 pt AF].
 
If the attached lens belongs to group H (p.84), you can only select 
[Manual select.:Spot AF] and [Manual selection:1 pt AF].
When [  
 Main Dial] is set, use the <
9> to move the AF point 
horizontally.