The P Button - Nikon D7100 User Manual

The P button

Use the P button for quick access to a variety of functions during
viewfinder and live view photography, movie recording, and
playback.
X
Viewfinder Photography
Press P to view links to frequently-used shooting options at the
bottom of the information display (0 12).
Live View Photography/Movie Recording
Press P to display a list of the settings available during live view
photography or movie recording (0 157, 164).
Playback
Pressing P during photo or movie playback displays retouch
(0 275) or movie edit (0 173) options.
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P button