A3: Focus Tracking With Lock-On; A4: Focus Points Used - Nikon Z fc N2016 Reference Manual

a3: Focus tracking with lock-on

Choose how quickly focus responds if something passes between the
subject and the camera when AF-C is selected for focus mode or when
AF-A is selected and you are shooting in AF-C.
･ Choose [5 (Delayed)] to help maintain focus on your original subject.
･ Choose [1 (Quick)] to make it easier to shift focus to objects crossing
your field of view.
･ If [Auto-area AF], [Auto-area AF (people)], or [Auto-area AF
(animals)] is selected for AF-area mode, blocked shot AF response
will function in mode [3] when [2] or [1 (Quick)] is selected.

a4: Focus points used

Choose the number of focus points available for manual focus-point
selection when an option other than [Auto-area AF], [Auto-area AF
(people)], or [Auto-area AF (animals)] is selected for AF-area mode.
Option
6 [All points]
A Custom Settings: Fine-tuning camera settings
G button U A Custom Settings menu
G button U A Custom Settings menu
Every focus point available in the current AF-area mode
can be selected. The number of points available varies
with the AF-area mode.
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