Canon PowerShot S2 IS User Manual page 177

Tip for Using the Self-timer (p. 59)
Normally, the camera shakes a little when you press the shutter button.
Setting the self-timer to
allows the camera to stop shaking, thus preventing a blurred image.
Even better results can be obtained by placing the camera on a stable
surface or by using a tripod to shoot.
Exposure Compensation (p. 90)
This camera automatically adjusts the exposure to shoot images with the
optimal brightness. However, recorded images may sometimes be
brighter or darker than the actual image depending on the shooting
conditions. If this happens, adjust the exposure compensation manually.
Underexposure
The whole recorded image is dark, which makes
white elements of the image appear gray. Shooting
bright subjects or in backlit conditions may cause the
image to be underexposed. Adjust the exposure
compensation towards the (+) end.
Optimal Exposure
Overexposure
The whole recorded image is bright, which makes
black elements of the image appear gray. Shooting
dark subjects or in dark places may cause the image
to be overexposed. Adjust the exposure
compensation towards the (-) end.
delays the shutter release for 2 seconds and
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