A: Autofocus; A1: Af-C Priority Selection; A2: Built-In Af-Assist Illuminator - Nikon D5100 User Manual

a: Autofocus

a1: AF-C Priority Selection

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).
Option
G Release
F Focus

a2: Built-in AF-assist Illuminator

Choose whether the built-in AF-assist illuminator lights to assist
the focus operation when lighting is poor.
Option
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
On
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.
The AF-assist illuminator does not light to assist the focus operation. The camera
Off
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.
L
158
Photos can be taken whenever the shutter-release button is pressed.
Photos can only be taken once the camera has focused.
G button ➜ A Custom Settings menu
Description
G button ➜ A Custom Settings menu
Description