Nikon Z8 User Manual page 547

Option
[Save
individual
pictures
(RAW)]
[Overlay If [ON] is selected, earlier exposures will be superimposed on the view through
shooting] the lens. The earlier exposures aid composition of the next shot.
[Select first
exposure Choose the first exposure from the NEF (RAW) pictures on the memory card.
(RAW)]
Creating a Multiple Exposure
1
Highlight [Multiple exposure] in the photo shooting menu
and press 2.
2
Choose an option for [Multiple exposure mode].
Highlight [Multiple exposure mode] and press 2.
Highlight a multiple exposure mode using 1 or 3 and press
J.
If [On (series)] or [On (single photo)] is selected, an icon
will appear in the display.
[ON]: Save both the multiple exposure and the shots that make it up; the
pictures are saved in NEF (RAW) format.
[OFF]: Discard the individual shots and save only the multiple exposure.
Description
473
Multiple Exposure