Canon IXUS 115 HS - Manual (Page 97)

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You can choose the subject you want to focus on and shoot.
Choose [Tracking AF].
 Press the n button to choose [AF
Frame] from the 4 tab, then press the qr
buttons to choose [Tracking AF].
 will appear in the center of the screen.
Choose the subject to focus on.
 Point the camera so that is on the
subject you want to focus on and press the
q button.
 The camera will beep and will appear
when a subject is detected. The camera
will continue to track the subject within a
certain range even if the subject moves.
 If the camera does not detect the subject,
will appear on the screen.
 To cancel tracking, press the q button
again.
Shoot.
 Press the shutter button halfway. will
change into a blue which will follow the
subject while the camera continues to
adjust the focus and exposure (Servo AF)
(p. 100) .
 Press the shutter button fully to shoot.
 Even after shooting completes, will
appear, and the camera will continue to
track the subject.
Choosing the Subject to Focus On
(Tracking AF)