Canon A610 - Manual (Page 68)

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Raise the ISO speed when you wish to reduce the effects of
camera shake, turn the flash off when shooting in a dark area, or
use a fast shutter speed.
Although the built-in flash will fire with automatic flash adjustments
(except in the
mode), it is also possible to set it so that it fires
without any adjustments.
Adjusting the ISO Speed
Shooting Mode
1
FUNC. Menu * (ISO Speed).
See Menus and Settings ( p. 22 ).
* Default setting.
z Use the or button to select an
ISO speed and press the FUNC./SET
button.
z Selecting [Auto] sets the sensitivity to
produce the optimal image quality.
Switching between Flash Adjustment
Settings
Shooting Mode
1
(Rec.) Menu [Flash Adjust] [Auto]/
[Manual].
See Menus and Settings ( p. 23 ).