Nikon D800 - Manual (Page 87)

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Exit live view mode.
Press the a button to exit live view
mode.
Indices
If Index marking is selected for Custom
Setting g2 (Assign preview button,
0 322),
you can press the depth-of-field preview
button during recording to add indices that
can be used to locate frames during editing
and playback (
0 73). Up to 20 indices can be
added to each movie.
Depth-of-field
preview button
Index