Canon PowerShot SX400 IS Black 手册

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页码 254
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 Contents
 
If faces are not detected, or when only gray frames are displayed 
(without a white frame), up to nine green frames are displayed in 
the areas in focus when you press the shutter button halfway.
 
If faces are not detected when Servo AF (
the AF frame is displayed in the center of the screen when you 
press the shutter button halfway.
 
Examples of faces that cannot be detected:
 
-
Subjects that are distant or extremely close
 
-
Subjects that are dark or light
 
-
Faces in profile, at an angle, or partly hidden
 
The camera may misinterpret non-human subjects as faces.
 
No AF frames are displayed if the camera cannot focus when you 
press the shutter button halfway.
Choosing Subjects to Focus On (Tracking AF)
 Still Images 
 
Movies
Shoot after choosing a subject to focus on as follows.
Choose [Tracking AF].
 
choose [Tracking AF].
 
[
] is displayed in the center of the 
screen.