Canon PowerShot SX170 IS - Manual (Page 112)

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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 ( = 114 ) 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.
Still Images
Choosing Subjects to Focus On (Tracking AF)
Shoot after choosing a subject to focus on as follows.
1
Choose [Tracking AF].
z z Follow the steps in “Changing
the AF Frame Mode” ( = 110 )
to choose [Tracking AF].
z z [ ] is displayed in the center of
the screen.