Canon POWERSHOT A480 User Manual page 19

The shutter button has two stops. To take images that are in focus, be sure
to first press the shutter button lightly (halfway) to focus, then take the shot.
Press halfway (lightly to the first
stop).
The camera automatically makes the
necessary settings for shooting, such as
focusing and setting the brightness.
When the camera focuses, it wi[[ beep
twice.
Press fully (to the second stop).
The camera plays the shutter sound and
takes the shot.
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