Canon PowerShot A720 IS User Manual page 18

Shooting Using the Mode Dial I 83
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Setting the Shutter Speed []
[] See Functions Available in Each Shooting Mode (p. 206).
When you set the shutter speed, the camera automatically selects an
aperture value to match the brightness of the subject. Faster shutter
speeds allow you to catch an instantaneous image of a moving subject,
while slower speeds create a flowing effect and allow you to shoot
without a flash in dark areas.
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_1. Use the ÷ or ,_ button to change the shutter speed.
• tf the aperture value is shown in red when the shutter button is
pressed halfway, the image is underexposed (insufficient light)
or overexposed (too much light). Use the ÷ or "F button to
adjust the shutter speed until the aperture value shows in
_ white.
The nature of CCD is such that noise in
image sensors
the
recorded image increases at slow shutter speeds. This
camera, however, applies special processing to images shot at
shutter speeds of 1.3 seconds or slower to eliminate the noise ,
thereby producing high-quality images. (However, a certain
amount of processing time may be required befo[e the next
image can be shot.)