Canon POWERSHOT SD630 DIGITAL ELPH User Manual page 66

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.
iii IIP e st.e ¸SO b.tt .a-ds i .setti.gs ........
': lCycle through the _/_1_/_1_1_/_ speeds with
each press of the I_;0 button.
lSelecting [] (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.
i lSelecting [] (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.
[ lWhen in [] (Auto) shooting mode only [] or [] can be
selected.
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