Every time you take a picture, regardless of the lighting conditions. Use when the subject is in shadow or is "backlit" (when the light is behind the subject). In low light, hold the camera steady or use a tripod.
Red Eye
Your camera can correct red-eye using 2 methods. To choose a red eye setting, see .
Preflash
A preflash fires, shrinking the eye pupil, before the picture is taken.
Digital Correction
A preflash does not fire; the camera corrects red eye.