Nikon D800 - Manual (Page 388)

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364
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Compare retouched copies to the original photographs. This
option is only available if the
J button is pressed to display the
retouch menu when a copy or original is played back full frame.
1
Select a picture.
Select a retouched copy
(shown by a
N icon) or a
photograph that has been
retouched in full-frame
playback and press
J.
2
Select Side-by-side
comparison.
Highlight Side-by-side
comparison and press
J.
Side-by-Side Comparison
J button