Canon A550 - Manual (Page 54)

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Raise the ISO speed to use a fast shutter speed when you wish to
reduce the effects of camera shake or avoid blurry subjects, or to
turn the flash off when shooting in a dark area.
Adjusting the ISO Speed
Shooting Mode
1
Press the IISO button to cycle
through ISO settings.
z You can advance to the next option
each time you press the button: */
/ / / / / .
* Default setting.
z When in shooting mode, only or can be
selected.
z and are not available in long shutter mode (p. 45).
z Selecting (Auto) sets the optimal ISO speed according to
the light level when shooting. Since the ISO speed setting
will automatically be raised in dark places, the camera will
select a faster shutter speed and reduce the chances of
camera shake.
z Selecting (High ISO Auto)* sets the sensitivity to a
higher value than the setting. This sets the shutter speed
faster, reducing the potential for camera shake or blurry
subjects compared with the
setting.
* Noise in the recorded image may be higher than for the
setting.
When the camera is set to or and you press the shutter
button halfway, the camera will set and display the ISO speed.
This ISO speed will also appear in the playback information.