Nikon Z9 Mirrorless Camera - Manual (Page 424)

424 Using an On-Camera Flash
D Shutter Speed
Shutter speed can be set as follows when an optional flash unit is used:
* Shutter speed may be set as slow as 30 s if slow sync, slow rear-curtain
sync, or slow sync with red-eye reduction is selected for flash mode.
D Caution: Third-Party Flash Units
The camera cannot be used with flash units that would apply voltages over
250 V to the camera’s X contacts or short-circuit contacts on the accessory
shoe. Use of such flash units could not only interfere with normal operation
of the camera but also damage the flash sync circuits of the camera and/or
flash.
Shooting mode Shutter speed
P , A Set automatically by camera ( 1 /
200
s– 1 /
60
s) *
S 1 /
200
s–30 s
M 1 /
200
s–30 s, Bulb , Time