Canon PowerShot SX170 IS - Manual (Page 115)

115
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• Focusing may not be possible in some shooting conditions.
• In low-light conditions, Servo AF may not be activated
(AF frames may not turn blue) when you press the shutter
button halfway. In this case, the focus and exposure are
set according to the specified AF frame mode.
• If adequate exposure cannot be obtained, shutter speeds
and aperture values are displayed in orange. Release the
shutter button, and then press it halfway again.
• AF lock shooting is not available.
• [AF-Point Zoom] on the [ 4] tab is not available.
• Not available when using the self-timer ( = 61 ).
Still Images
Changing the Focus Setting
You can change default camera operation of constantly focusing
on subjects it is aimed at, even when the shutter button is not
pressed. Instead, you can limit camera focusing to the moment
you press the shutter button halfway.
z z Press the < n> button,
choose [Continuous AF] on the
[ 4] tab, and then choose [Off]
( = 45 ).
On
Helps avoid missing sudden photo opportunities, because the
camera constantly focuses on subjects until you press the shutter
button halfway.
Off
Conserves battery power, because the camera does not focus
constantly.