Canon PowerShot ELPH 180 Silver 手册

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页码 216
94
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 Contents
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 Chapter Contents
Still Images
Movies
Center
One AF frame is displayed in the center. Effective for reliable focusing.
A yellow AF frame is displayed with [ ] if the camera 
cannot focus when you press the shutter button halfway.
To compose shots so that subjects are positioned at the edge or in 
a corner, first aim the camera to capture the subject in an AF frame, 
and then hold the shutter button halfway down. As you continue to 
hold the shutter button halfway, recompose the shot as desired, and 
then press the shutter button all the way down (Focus Lock).