Nikon D800 User Manual (en)

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U
Choose the role played by the depth-of-field preview button 
during movie live view.
g2: Assign Preview Button
G button
➜ A Custom Settings menu
Option
Description
q
Power aperture 
(close)
Aperture narrows while the button is pressed.  Use in 
combination with Custom Setting g1 (Assign Fn 
button
) > Power aperture (open) for button-
controlled aperture adjustment.
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.
A
Power Aperture
Power aperture is available only in exposure modes g and h and can not 
be used during recording or while photo shooting info is displayed (a 
icon indicates that power aperture can not be used). The display may 
flicker while aperture is adjusted.