Nikon L820 - Manual (Page 187)

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AF Assist
You can enable or disable the AF-assist illuminator, which assists autofocus operation when
the subject is dimly lit.
d button M z menu icon M AF assist M k button
Option Description
a Auto
(default setting)
The AF-assist illuminator lights automatically when the subject is dimly lit.
The illuminator has a range of about 5.0 m (16 ft) at the maximum wide-angle
position and about 5.0 m (16 ft) at the maximum telephoto position.
Note that for some scene modes such as Museum (
A 41) and Pet portrait
( A 44), the AF-assist illuminator may not light even when Auto is selected.
Off
The AF-assist illuminator does not light. The camera may be unable to focus
under dim lighting.