Nikon D810 - Manual (Page 192)

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5
Copy white balance.
Press J to copy the white balance value for the highlighted
photograph to the selected preset. If the highlighted
photograph has a comment (0 375), the comment will be
copied to the comment for the selected preset.
A
Choosing a Source Image
To view the image highlighted in Step 4 full frame, press and hold the
X button.
X
button
To view images in other locations, press W. The dialog shown below
will be displayed; select the desired card and folder.
W
button