Olympus AZ-4 Zoom - Manual (Page 14)

Press the shutter release button halfway to
focus.
13 * The button can be pressed in two steps;
autofocus operates when the button is
pressed to the first of these steps.
* When the camera is in focus, the green
focus lamp comes on in the Viewfinder
and you will hear the "beep-beep"
sound.
* The shutter speed and the aperture will
be indicated in the Viewfinder. (See p. 46)
* When the shutter speed indicator is
blinking, change to the flash mode.
(See p. 34) If you do not use the flash in
this case, the shutter speed may be too
slow and it is recommended that you use
a tripod to avoid the effects of camera
shake.
* If the camera is not in focus, the red
focus-aid lamp will blink. In this case,
push the shutter release button again.
* The shutter cannot be released while the
focus-aid indicator is blinking.