Nikon COOLPIX S3400, Reference Manual, Page: 194 / 248

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Refe
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AF Assist
Enable or disable AF-assist illumination, which assists autofocus operation when the subject is
poorly lit.
Press the
d
button
M z
menu icon
M
AF assist
M k
button
Option Description
a
Auto
(default setting)
AF-assist illumination is used to assist the focus operation when the
subject is poorly lit. The illuminator has a range of about 1.9 m (6 ft 2 in.) at
the maximum wide-angle position and about 1.5 m (4 ft 11 in.) at the
maximum telephoto position.
Note that for some scene modes such as
Museum (
A
45) or Pet
portrait (
A
46) scene mode, or focus areas, the AF-assist illuminator
may not light even when Auto is selected.
Off
AF-assist illuminator does not light up. The camera may be unable to
focus under dim lighting.