Canon rebel t3 Guida Utente

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You can select the AF (autofocus) mode to suit the shooting conditions 
or subject. In Basic Zone modes, the most suitable AF mode is set 
automatically.
1
On the lens, set the focus mode 
switch to <AF>.
2
Press the <
ZE> button.
X
[AF mode] will appear.
3
Select the AF mode.
 
Press the <
U> key or turn the 
<6> dial to select the desired AF 
mode, 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 mode.
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 briefly in red, and the focus confirmation light <o> in the 
viewfinder will also light.
 
With evaluative metering (p.100), 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.
E
: Changing the Autofocus ModeN
One-Shot AF for Still Subjects
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