Canon PowerShot A 640 User Manual page 18

The time required for flash recharging will change depending
on usage conditions and remaining battery power.
• Setting the Red-Eye Reduction Function
You can set whether the camera automatically performs red-eye
reduction when the flash fires.
1.
CI
(Ree.) Menu
* Default setting .
[Red-Eye]
~
[On]*/[Off].
See Menus and Settings (p. 22).
• Setting the Slow Synchro Function
The flash timing is adjusted to slow shutter speeds. This reduces the
chance that only the background will appear dark when a person is
shot against a twilight background or night scene, or when an interior
shot is taken.
1.
CI
(Ree.) Menu [Slow Synehro] [On]/[Off]*.
See Menus and Settings (p. 22).
* Default setting.
Slow synchro shooting and configuration is
available in the
c:Q,
P
and
Av
modes.
When [Slow Synchro] is set to [On], camera shake may
become a factor. Use of a tripod is recommended.
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