Nikon D5100 a: Autofocus

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When AF-C is selected for viewfinder photography (039), 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 ➜ACustom Settings menu
Option Description
GRelease Photos can be taken whenever the shutter-release button is pressed.
FFocus Photos can only be taken once the camera has focused.
a2: Built-in AF-assist Illuminator G button ➜ACustom 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 (039) or single-ser vo autofocus is selected
when the viewfinder is used in AF-A mode.
2. e (Auto-area AF) is chosen for AF-area mode (042), 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.
ASee 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.