Changing The Iso Speed - Canon EOS Rebel XTi Instruction Manual

ISO:
Changing the ISO Speed
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Set the ISO speed (imaging sensor's sensitivity to light) to suit the
ambient light level. For example, when you increase the ISO speed
(higher number) for low light, a faster shutter speed can be used and
camera shake will be less prone to occur. The effective range of the
flash will also increase.
Press the
<... ISO>
button.
[ISO speed] will appear.
Select the ISO speed.
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Press the
< ...
:~
>
key to select the
desired ISO speed, then press the
shutter button halfway.
ISO Speed Guide
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Using a high ISO speed or shooting in high-temperature conditions may
result in slightly grainy images.
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High temperatures, high ISO speeds, or long exposures may cause
irregular colors in the image.
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