Nikon Df User Manual page 207

A
Rotate Tall
To display "tall" (portrait-orientation)
photographs in tall orientation, select On for the
Rotate tall option in the playback menu
(0 233).
A
Image Review
When On is selected for Image review in the playback menu (0 232),
photographs are automatically displayed in the monitor for about 4 s
after shooting (because the camera is already in the correct orientation,
images are not rotated automatically during image review). In
continuous release mode, display begins when shooting ends, with the
first photograph in the current series displayed.
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See Also
For information on choosing how long the monitor will remain on when
no operations are performed, see Custom Setting c4 (Monitor off
delay, 0 253).
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