Canon POWERSHOT A2400IS User Manual page 88

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This mode helps avoid missing shots of subjects in motion, because the
camera continues to focus on the subject and adjust the exposure as long as
you press the shutter button halfway.
Configure the setting.
Press the
MENU
button, choose [Servo AF]
on the O tab, and then choose [On] (p. 45).
Focus.
The focus and exposure are maintained
where the blue AF frame is displayed while
you are pressing the shutter button halfway.
(_ 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 O tab is not available.
Not available when using the self-timer (p. 57).
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