Nikon Z 5 Reference Manual page 688

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In mode P, the maximum aperture (minimum f-number) is limited
according to ISO sensitivity, as shown below:
Maximum aperture (f-number) at ISO equivalent of:
100
4
* If the maximum aperture of the lens is smaller than given above, the
maximum value for aperture will be the maximum aperture of the lens.
•
The SB-5000, SB-910, SB-900, SB-800, SB-700, SB-600, SB-500, and
SB-400 provide red-eye reduction in red-eye reduction and slow-sync
with red-eye reduction flash modes.
•
"Noise" in the form of lines may appear in flash photographs taken with
an SD-9 or SD-8A high-performance battery pack attached directly to
the camera. Reduce ISO sensitivity or increase the distance between the
camera and the battery pack.
•
The camera provides AF-assist illumination as required. AF-assist
illuminators on optional flash units will not light.
•
When an SC-series 17, 28, or 29 sync cable is used for off-camera flash
photography, correct exposure may not be achieved in i-TTL mode. We
recommend that you select standard i-TTL fill-flash. Take a test shot and
view the results in the camera display.
•
In i-TTL, do not use any form of flash panel (diffusion panel) other than
the flash unit's built-in flash panel or supplied bounce adapter. Using
other panels may produce incorrect exposure.
D
Flash Compensation for Optional Flash Units
In i-TTL and auto aperture ( q A) flash control modes, the flash
compensation selected with the optional flash unit or the camera [Flash
control] item is added to the flash compensation selected with the [Flash
compensation] item in the photo shooting menu.
Compatible Flash Units
646
200 400
5 5.6
800 1600
7.1 8
3200 6400
10 11
12800
13