Nikon D800 - Manual (Page 345)

En_03
321
U
Choose the role played by the Fn button during movie live view.
g: Movie
g1: Assign Fn Button
G button ➜ A Custom Settings menu
Option Description
t
Power aperture
(open)
Aperture widens while the button is pressed. Use in
combination with Custom Setting g2 (Assign
preview button) > Power aperture (close) for
button-controlled aperture adjustment.
r Index marking
Press the button during movie recording to add an
index at the current position (
0 63). Indices can be
used when viewing and editing movies.
s
View photo
shooting info
Press the button to display information on shutter
speed, aperture, and other photo settings in place of
movie recording information. Press again to return to
the movie recording display.
None Pressing the button has no effect.