Nikon Z 8 Reference Manual page 481

3
Choose an [HDR strength].
Highlight [HDR strength] and press 2.
Highlight an option using 1 or 3 and press J.
If [Auto] is selected, the camera will automatically adjust
HDR strength to suit the scene.
4
Choose a setting for [Save individual pictures (RAW)].
Choose [ON] to save each of the individual shots used to
create the HDR picture; the shots are saved in NEF (RAW)
format.
5
Frame the photograph, focus, and shoot.
The camera takes two exposures when the shutter-release button is pressed all the way
down.
"Busy" will flash in the control panel while the pictures are
combined. No photographs can be taken until recording is
complete.
If [On (series)] is selected for [HDR mode], you can
continue to take HDR photographs until [Off] is selected.
If [On (single photo)] is selected, HDR will turn off
automatically after a single shot.
HDR photographs are recorded in JPEG format regardless of
the option selected for image quality.
481
HDR Overlay