Nikon L810 - Manual (Page 166)

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AF Assist
Enable or disable AF-assist illuminator, which assists autofocus operation when the subject is
dimly lit.
d button M z tab M AF assist M k button
Option Description
Auto
(default setting)
AF-assist illuminator will be used to assist the focus operation when the
subject is dimly lit. The illuminator has a range of about 4.5 m (14 ft) at the
maximum wide-angle position and about 3.0 m (9 ft 10 in.) at the maximum
telephoto position.
Note that for some scene modes such as Museum (
A 40) and Pet portrait
( A 42), the AF-assist illuminator may not light even when Auto is selected.
Off
AF-assist illuminator does not light. The camera may be unable to focus
under dim lighting.