Nikon D750 DSLR Camera (Body Only) - Manual (Page 360)

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Choose whether the built-in AF-assist
illuminator lights to assist the focus
operation when lighting is poor.
a9: Built-in AF-assist Illuminator
G button
➜
A Custom Settings menu
Option Description
On
The AF-assist illuminator lights when lighting is poor
(viewfinder photography only). AF-assist illumination is
only available when both of the following conditions are
met:
1.
AF-S is selected for autofocus mode ( 0 121) or single-
servo autofocus is selected when the camera is in AF-A
mode.
2. Auto-area AF is chosen for AF-area mode ( 0 123), or an
option other than auto-area AF 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
The AF-Assist Illuminator
The AF-assist illuminator has a range of about 0.5–3.0 m (1 ft 8 in.–9 ft
10 in.); when using the illuminator, remove the lens hood.