Nikon COOLPIX 5400 Manual page 154

The Setup Menu
AE-L, AF-L
By default, both focus and exposure are locked
when the AE/AF-L button is pressed. If desired,
the button can be set to lock only one of focus
and exposure.
Option
AE-L & AF-L Pressing AE/AF-L button locks both focus and exposure.
Pressing AE/AF-L button locks exposure only. Focus locks when shut-
AE-L
ter-release button is pressed halfway.
Pressing AE/AF-L button locks focus only. Exposure locks when shut-
AF-L
ter-release button is pressed halfway.
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AE-L & AF-L
AE-L
AF-L
Description
AE-L, AF-L