Canon A630 - Manual (Page 18)

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Setting the Red-Eye Reduction Function
You can set whether the camera automatically performs red-eye
reduction when the flash fires.
1.
(Rec.) Menu [Red-Eye] [On]*/[Off].
See Menus and Settings (p. 22) .
* Default setting.
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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.
(Rec.) Menu [Slow Synchro] [On]/[Off]*.
See Menus and Settings (p. 22) .
* Default setting.
Slow synchro shooting and configuration is
available in the
, and modes.
The time required for flash recharging will change depending
on usage conditions and remaining battery power.
When [Slow Synchro] is set to [On], camera shake may
become a factor. Use of a tripod is recommended.