Nikon D800 User Manual (en)

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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:
AF-S is selected for autofocus mode (
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.