Canon PowerShot SD990 IS User Manual page 66

You can set various functions as you like for shooting.
AE stands for Auto Exposure.
Set the mode dial to
P/M
(p. 40).
Turn the
@
dial to
p.
Make settings according to
purpose (pp. 67 - 75).
Shoot.
If a correct exposure cannot be obtained when pressing the shutter button
halfway, shutter speed and aperture value are shown in red. Try the following
settings to obtain the correct exposure.
Turn on the flash (p. 67)
Select a higher ISO speed (p. 70)
66