Canon POWERSHOT A550 User 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.
Press the ISO button to cycle
through ISO settings.
• You can advance to the next option
each time you press the button: []*/
[]/[]/[_/[]/[_/[]
* Default setting.
OWhen in _ shooting mode, only [] or [] can be
selected.
• [] and [] are not available in long shutter mode (p. 45).
• 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.
• 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.
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