Nikon D810 - Manual (Page 419)

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Image overlay combines two existing NEF (RAW) photographs to
create a single picture that is saved separately from the originals;
the results, which make use of RAW data from the camera image
sensor, are noticeably better than photographs combined in an
imaging application. The new picture is saved at current image
quality and size settings; before creating an overlay, set image
quality and size (0 79, 83; all options are available). To create a
NEF (RAW) copy, choose an image quality of NEF (RAW) and an
image size of Large (the overlay will be saved as a large NEF/
RAW image even if Small is selected).
A
Zoom
To zoom in on the image displayed in the
monitor, press X. The histogram will be
updated to show data only for the portion
of the image displayed in the monitor.
While the image is zoomed in, press
L (Z/Q) to toggle back and forth
between color balance and zoom. When
zoom is selected, you can zoom in and out with the X and W buttons
and scroll the image with the multi selector.
Image Overlay
G
button ➜ N retouch menu
+