Canon IXUS 990IS - Manual (Page 74)

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Select the ISO speed.
● Press the m button and select ,
then press the m button.
● Press the op buttons or turn the  dial
to select an option, then press the m
button.
Once set, the ISO speed will appear on
the screen.
Approximate Values for ISO Speed
• 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.
Changing the ISO Speed
Automatically adjusts the ISO speed to the shooting mode and shooting
conditions.
Low
High
Fine weather conditions, outdoor shooting.
Cloudy, Twilight
Nightscapes, Dark interiors
Changing the ISO speed
• When the camera is set to , you can press the shutter button halfway
to display the automatically set ISO speed.
• With ISO 3200 you can set an even faster speed (p. 58) .