Canon PowerShot SX170 IS - Manual (Page 111)

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• To reduce the AF frame size, press the < n> button and set [AF
Frame Size] on the [ 4] tab to [Small] ( = 45 ).
• The AF frame size is set to [Normal] when you use the digital zoom
( = 59 ) or digital tele-converter ( = 109 ), and in manual focus
mode ( = 108 ).
• To compose shots so that subjects are positioned at the edge or in
a corner, first aim the camera to capture the subject in an AF frame,
and then hold the shutter button halfway down. As you continue to
hold the shutter button halfway, recompose the shot as desired, and
then press the shutter button all the way down (Focus Lock).
Still Images Movies
Face AiAF
• Detects people’s faces, and then sets the focus, exposure
(evaluative metering only), and white balance ([ ] only).
• After you aim the camera at the subject, a white frame is
displayed around the person’s face determined by the camera
to be the main subject, and up to two gray frames are displayed
around other detected faces.
• When the camera detects movement, frames will follow moving
subjects, within a certain range.
• After you press the shutter button halfway, up to nine green
frames are displayed around faces in focus.