Nikon Df - Manual (Page 331)

311
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Compare retouched copies to the original photographs. This
option is only available if P button is pressed to display the
retouch menu when a copy or original is played back full frame.
1
Select a picture.
In full-frame playback,
select a retouched copy
(shown by a o icon) or a
photograph that has been
retouched and press P.
2
Select Side-by-side
comparison.
Highlight Side-by-side
comparison and press J.
Side-by-side Comparison
P button