Nikon D780 DSLR Camera (Body Only) - Manual (Page 313)

267 Options for Movie Recording and Editing
D Slow-Motion Movies
• When a slow-motion option is selected, quality is fixed at “high quality”
and the image area is fixed at [
FX ] regardless of the lens used or the
option selected for [ Image area ] > [ Choose image area ] in the movie
shooting menu ( 0 129).
• Features such as flicker reduction, electronic vibration reduction, and
time code output cannot be used when a “slow-motion” option is
selected.