Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 97)

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You can select the AF (autofocus) operation characteristics suiting the
shooting conditions or subject. In Basic Zone modes, the optimum AF
operation is set automatically for the respective shooting mode.
1 On the lens, set the focus mode
switch to .
2 Press the <Zf> button.
X
[AF operation] will appear.
3 Select the AF operation.
Press the key or turn the
<6> dial to select the desired AF
operation, then press <0>.
4 Focus the subject.
Aim the AF point over the subject and
press the shutter button halfway. The
camera will then autofocus in the
selected AF operation.
f: Changing the Autofocus OperationN
COP
Y