Nikon Z 8 Reference Manual page 294

"Output Resolution"
When [Auto] is selected for [HDMI] > [Output resolution] in the setup menu, the camera
automatically detects whether the external recorder supports the frame size and rate selected on
the camera. If it does not, the camera will search for a supported resolution and frame rate in the
order listed below. If no supported resolution and frame rate is found, output will be suspended.
- No memory card inserted in camera:
Frame size/frame rate
[7680×4320; 30p]
[7680×4320; 25p]
[7680×4320; 24p]
[3840×2160; 120p]
[3840×2160; 100p]
[3840×2160; 60p]
[3840×2160; 50p]
[3840×2160; 30p]
[3840×2160; 25p]
[3840×2160; 24p]
[1920×1080; 120p]
[1920×1080; 100p]
[1920×1080; 60p]
[1920×1080; 50p]
[1920×1080; 30p]
Output resolution/frame rate search order
4320/30p V 2160/30p V 1080/30p
4320/25p V 2160/25p V 1080/25p
4320/24p V 2160/24p V 1080/24p
2160/120p V 1080/120p V 2160/60p V 1080/60p V 2160/30p V
1080/30p
2160/100p V 1080/100p V 2160/50p V 1080/50p V 2160/25p V
1080/25p
2160/60p V 1080/60p V 2160/30p V 1080/30p
2160/50p V 1080/50p V 2160/25p V 1080/25p
2160/30p V 1080/30p
2160/25p V 1080/25p
2160/24p V 1080/24p
1080/120p V 1080/60p V 1080/30p
1080/100p V 1080/50p V 1080/25p
1080/60p V 1080/30p
1080/50p V 1080/25p
1080/30p
294
Recorders