Canon EOS 5D Mark III Instruction Manual (en)

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You can easily fine-tune AI Servo AF to suit a particular subject or 
scene just by selecting between case 1 to case 6. This feature is called 
the “AF Configuration Tool.”
1
Select the [21] tab.
2
Select a case.
 
Turn the <5> dial to select a case 
icon, then press <
0>.
X
The selected case will be set. The 
selected case is indicated in blue.
As explained on pages 92 to 94, case 1 to 6 are six setting 
combinations of subject-tracking sensitivity, acceleration/deceleration 
tracking, and AF point auto switching. Refer to the table below to select 
the case applicable to the subject or scene.
3
 Selecting AI Servo AF Characteristics (For a Subject)N
About Case 1 to 6
Case
Icon
Description
Applicable Subjects
Page
Case 1
Versatile multi purpose 
setting
For any moving subject.
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Case 2
Continue to track the 
subject, ignoring possible 
obstacles
Tennis players, butterfly 
swimmers, freestyle skiers, 
etc.
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Case 3
Instantly focus on subjects 
suddenly entering AF 
points
Starting line of a bicycle 
race, alpine downhill skiers, 
etc.
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Case 4
For subjects that accelerate 
or decelerate quickly
Soccer, motor sports, 
basketball, etc.
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Case 5
For erratic subjects moving 
quickly in any direction
Figure skaters, etc.
90
Case 6
For subjects that change 
speed and move erratically
Rhythm gymnastics, etc.
91