Canon 850 IS - Manual (Page 36)

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Setting the red-eye reduction function* to [On] causes the red-eye
reduction lamp to fire with the flash.
*This function reduces the effect of light reflecting back from the eyes and making
them appear red.
You can shoot with the flash at slow shutter speeds. This is handy
for shooting at night or under artificial lighting indoors.
Red-Eye Reduction Function
Shooting Mode
1
(Rec.) Menu [Red-Eye] [On]*/[Off].
See Menus and Settings (p. 23) .
*Default setting.
Setting the Slow Synchro Function
Shooting Mode
1
(Rec.) Menu [Slow Synchro] [On]/
[Off]*.
See Menus and Settings (p. 23) .
*Default setting.
You are recommended to fix the camera to a tripod to shoot in
this mode.