Nikon D800 - Manual (Page 101)

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Saving Selected Frames
To save a copy of a selected frame as a JPEG still:
1
View the movie and
choose a frame.
Play the movie back as
described on page 72; your
approximate position in the
movie can be ascertained from the movie progress bar. Pause
the movie at the frame you intend to copy.
2
Display movie edit options.
Press J to display movie
edit options.
3
Choose Save selected
frame.
Highlight Save selected
frame and press
J.
4
Create a still copy.
Press 1 to create a still copy
of the current frame.
J button