Canon EOS 550D 用户手册

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页码 260
68
In the Basic Zone modes, all the AF points are active. Generally, the AF 
point covering the closest subject will be selected to focus. Therefore, 
the camera sometimes may not focus the subject you want.
With the <d> (Program AE), <s>, <f>, and <a> modes, you can 
select one AF point to focus where you want.
1
Press the <S> button. 
(9)
X
The selected AF point will be 
displayed on the LCD monitor and in 
the viewfinder.
 
When all AF points light up, automatic 
AF point selection will be set.
2
Select the AF point.
 
Press the <S> key to select the AF 
point.
 
While looking at the viewfinder, you 
can select the AF point by turning the 
<6> dial until the desired AF point 
lights in red.
 
Pressing <0> toggles the AF point 
selection between the center AF point 
and automatic AF point selection.
3
Focus the subject.
 
Aim the selected AF point over the 
subject and press the shutter button 
halfway to focus.
S
 Selecting the AF PointN
COP
Y