Nikon D300 User Manual (en)

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a9: Built-in AF-assist Illuminator
Choose whether the built-in AF-assist 
illuminator lights to assist the focus 
operation 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 355 for restrictions on the lenses that can be used with AF assist.
Option
Description
On
(default)
The AF-assist illuminator lights when lighting is poor. AF-
assist illumination is only available when both of the 
following conditions are met:
1. Single-servo autofocus is selected for focus mode (pg. 62).
2. Auto-area AF is chosen for AF-area mode (pg. 64), or 
single-point or dynamic-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.