Nikon S5200 - Manual (Page 224)

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AF Assist
Enable or disable AF-assist illuminator, which assists autofocus operation when the subject is
dimly lit.
Press the d button M z menu icon M AF assist M k button
Option Description
a 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 3.0 m (9 ft
10 in.) at the maximum wide-angle position and about 2.0 m (6 ft
6 in.) at the maximum telephoto position.
Note that for some scene modes (such as Museum (
A45) and Pet
portrait ( A48)) or focus areas, 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.