Nikon D5100 - Manual (Page 176)

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.