Canon A3400 IS 6186B011 User Manual (en)

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Shooting Range and Focusing
100
One AF frame is displayed in the center. Effective for reliable focusing.
One AF frame is displayed. Effective for reliable focusing.
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 (p. 103) is set to [On], 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.
Center
Fixed Frame
A yellow AF frame is displayed with 
 if the camera cannot focus 
when you press the shutter button halfway. Note that AF-point 
zooming (p. 108) is not possible.
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A3400 IS
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