B4: B Mode Exposure Comp; C: Timers/Ae Lock; C1: Shutter-Release Button Ae-L - Nikon Z fc N2016 Reference Manual

Fine-tuning exposure
D
Regardless of the option selected for Custom Setting b3 [Fine-tune optimal
exposure], the exposure compensation icon (E) will not be displayed. The
only way to determine how much exposure has been altered is to view the
amount in the fine-tuning menu for Custom Setting b3.

b4: b mode exposure comp.

When set to [Disable], the exposure compensation cannot be adjusted
in mode b.

c: Timers/AE lock

c1: Shutter-release button AE-L

Choose whether exposure locks when the shutter-release button is
pressed.
Option
O [On (half press)]
[On (burst
P
mode)]
[Off]
A Custom Settings: Fine-tuning camera settings
G button U A Custom Settings menu
G button U A Custom Settings menu
Pressing the shutter-release button halfway locks
exposure.
Exposure only locks while the shutter-release
button is pressed all the way down.
Pressing the shutter-release button does not lock
exposure.
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Description