Canon PowerShot SX400 IS User Manual page 114

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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 ( = 116) is set to [On],
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the AF frame is displayed in the center of the screen when you
press the shutter button halfway.
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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
-
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The camera may misinterpret non-human subjects as faces.
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No AF frames are displayed if the camera cannot focus when you
press the shutter button halfway.
Choosing Subjects to Focus On (Tracking AF)
Shoot after choosing a subject to focus on as follows.
1
Choose [Tracking AF].
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Follow the steps in "Changing
the AF Frame Mode" ( = 112) to
choose [Tracking AF].
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[ ] is displayed in the center of the
screen.
Still Images
114
Movies