Nikon Nuvis A20 Manual De Instrucciones página 15

"Anytime flash" mode (See Fig. N on page 38.)
Whenever you want to use fill-flash for backlit situations, press the "anytime
flash/red-eye reduction" button while shooting.
Red-eye reduction
In flash photography, the subject's eyes sometimes appear bright red in color
pictures due to a phenomenon known as "red-eye." To counteract this effect, your
camera is equipped with a red-eye reduction lamp. Under low light situations, when
releasing the shutter with the "anytime flash/red-eye reduction" button depressed,
the red-eye reduction lamp automatically lights up, causing the size of the subject's
pupil to grow smaller, minimizing the red-eye effect.
H o w t o u s e f o c u s lock (See Fig. O on page 38.)
1 Center the autofocus frame mark on the subject.
2 Lightly press the shutter release button to lock focus on the subject.
3 Keeping the shutter release button lightly pressed, recompose the scene.
Then fully depress the shutter release button.
Note: To cancel focus lock, simply remove your finger from the shutter
release button.