Nikon D800 - Manual (Page 310)

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286
U
Choose whether the built-in AF-assist
illuminator lights to assist the focus operation
when lighting is poor.
a8: 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 91).
2 Auto-area AF is chosen for AF-area mode ( 0 93), 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, use a lens with a focal length of 24–
200 mm and remove the lens hood.
A
See Also
See page 377 for restrictions on the lenses that can be used with AF
assist.