Canon 650D - Manual (Page 95)

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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 <AF>.
2
Press the <Zf> button.
X [AF operation] will appear.
3
Select the AF operation.
Press the <U> 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.
Suited for still subjects. When you press the shutter button
halfway, the camera will focus only once.
When focus is achieved, the dot inside the AF point achieving focus
lights up briefly in red, and the focus confirmation light <o> in the
viewfinder will also light up.
With evaluative metering (p.115), the exposure setting will be set at
the same time focus is achieved.
While you hold down the shutter button halfway, the focus will be
locked. You can then recompose the shot if desired.
f
: Changing the Autofocus OperationN
One-Shot AF for Still Subjects
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