Canon POWERSHOT A480 User Manual page 67

Select the ISO speed.
After pressing the ._ button, press the
._'_ buttons to select the ISO speed, then
press the @ button.
Once set, the ISO speed will appear.
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Lowering the ISO speed results in sharper images, but there may be an
increased chance of image blurring in certain shooting conditions.
Raising the ISO speed results in a faster shutter speed, reducing camera shake
and letting the flash reach greater distances to the subject. The images,
however, will appear coarse.
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