Nikon Df - Manual (Page 310)

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Create a retouched copy.
Press J to create a retouched
copy. Retouched copies are
indicated by a o icon.
A
Creating Retouched Copies During Playback
Retouched copies can also be created during playback.
Display picture full
frame and press P.
Highlight an option
and press J.
Create retouched
copy.