Canon EOS 550D 用户手册

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 Selecting the AF PointN
 
When shooting a portrait up close, use One-Shot AF and focus 
the eyes.
If you focus the eyes first, you can then recompose and the face will 
remain sharp.
 
If it is difficult to focus, select and use the center AF point.
The center AF point is the most sensitive among the nine AF points. 
Also, with a fast lens from f/1.0 to f/2.8, high-precision focusing is 
possible with the center AF point.
 
To make it easier to focus a moving subject, set the camera to 
automatic AF point selection and AI Servo AF.
First use the center AF point to focus. If the subject moves away 
from the center AF point, the other AF points will continue to focus-
track the subject automatically.
1
Set the lens focus mode switch to 
<MF>.
2
Focus the subject.
 
Focus by turning the lens focusing 
ring until the subject looks sharp in 
the viewfinder.
Shooting Tips
MF: Manual Focusing
Focusing ring
If you press the shutter button halfway during manual focusing, the AF point 
achieving focus flashes in red briefly, the beeper sounds, and the focus 
confirmation light <o> in the viewfinder will light.
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