Nikon Z 8 Reference Manual page 857

Camera modeling illumination
Unified flash control
Camera flash unit firmware update
1 Available during close-up photography only.
2 Not available when RPT is selected as the flash control mode for the remote flash unit.
3 Available only when i‑TTL is selected as the flash control mode for the remote flash unit or when
the flash is configured to emit monitor preflashes in mode qA.
Supported features
857
4
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Compatible Flash Units