Nikon D5100 a: Autofocus, a1: AF-CPriority Selection, a2: Built-in AF-assistIlluminator

a: Autofocus

a1: AF-C Priority Selection

Gbutton ➜ ACustom Settings menu

When AF-Cis 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).

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		Gbutton ➜ ACustom Settings menu

Choose whether the built-in AF-assist illuminator lights to assist the focus operation when lighting is poor.

Option	Description
	The AF-assist illuminator lights when lighting is poor. AF-assist illumination is only
	available when both of the following conditions are met:
On	1. AF-Sis selected for focus mode (0 39) or single-servo autofocus is selected
	when the viewfinder is used in AF-Amode.
	2. e(Auto-area AF) is chosen for AF-area mode (0 42), or an option other than
	eis 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.

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