Nikon Z 5 Reference Manual page 428

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The following options are available:
[Select center
K
focus point]
A [AF-ON]
F
[AF lock only]
E [AE lock (Hold)]
[AE lock (Reset
D
on release)]
C
[AE lock only]
B
[AE/AF lock]
A Custom Settings: Fine-Tuning Camera Settings
386
Role
Pressing the control selects the center focus
point.
Pressing the control initiates autofocus,
duplicating the function of the AF-ON button.
Focus locks while the control is pressed.
Exposure locks when the control is pressed.
Exposure lock does not end when the shutter
is released. Exposure remains locked until the
control is pressed a second time or the
standby timer expires.
Exposure locks when the control is pressed.
Exposure remains locked until the control is
pressed a second time, the shutter is released,
or the standby timer expires.
Exposure locks while the control is pressed.
Focus and exposure lock while the control is
pressed.
Description