Canon PowerShot SX170 IS - Manual (Page 58)

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Still Images Movies
On-Screen Frames
A variety of frames are displayed once the camera detects
subjects you are aiming the camera at.
• A white frame is displayed around the subject (or person’s face)
determined by the camera to be the main subject, and gray
frames are displayed around other detected faces. Frames
follow moving subjects within a certain range to keep them in
focus.
However, if the camera detects subject movement, only the
white frame will remain on the screen.
• When you are pressing the shutter button halfway and the
camera detects subject movement, a blue frame is displayed,
and the focus and image brightness are constantly adjusted
(Servo AF).
• Try shooting in [G] mode ( = 94 ) if no frames are
displayed, if frames are not displayed around desired
subjects, or if frames are displayed on the background or
similar areas.