Canon EOS 5D Mark II Instruction Manual page 82

S Selecting the AF PointN
Selecting with the Dial
When looking at the LCD panel to select the AF point, note the following:
Automatic selection
right
If focus cannot be achieved with the external, EOS-dedicated Speedlite's
AF-assist beam, select the center AF point.
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When you turn the <6> or <5>
dial, the AF point selection will
change in the respective direction.
When all AF points light up, automatic
AF point selection will be set.
, center
, top
,