Nikon D5100, User Manual, Page: 265 / 365

158
L
When
AF-C
is selected for viewfinder photography (
0
39), this option controls
whether photographs can be taken whenever the shutter-release button is pressed
(
release priority ) or only when the camera is in focus ( focus priority ).
Choose whether the built-in AF-assist illuminator lights to assist
the focus operation when lighting is poor.
a: Autofocus
a1: AF-C Priority Selection
G button
➜
A
Custom Settings menu
Option Description
G
Release
Photos can be taken whenever the shutter-release button is pressed.
F
Focus Photos can only be taken once the camera has focused.
a2: Built-in AF-assist Illuminator
G button
➜
A Custom Settings menu
Option Description
On
The AF-assist illuminator lights when lighting is poor. AF-assist illumination is only
available when both of the following conditions are met:
1.
AF-S
is selected for focus mode (
0
39) or single-servo autofocus is selected
when the viewfinder is used in
AF-A
mode.
2. e ( Auto-area AF ) is chosen for AF-area mode (
0
42), or an option other than
e
is chosen and the center focus point is selected.
Off
The AF-assist illuminator does not light to assist the focus operation. The camera
may not be able to focus using autofocus when lighting is poor.
A
See Also
See page 41 for information on using the AF-assist illuminator. Information on the shooting
modes in which AF-assist is available may be found on page 216. See page 201 for
restrictions on the lenses that can be used with AF assist.