Nikon D850 Menu Manual page 155

Option
1
Record movies
None
A
Power Aperture
Power aperture is available only in exposure modes A and M and
cannot be used while photo shooting info is displayed (a 6 icon
indicates that power aperture cannot be used). The display may flicker
while aperture is adjusted.
D
"Record Movies"
When Record movies is selected for Shutter-release button, interval
timer photography is not available.
Press the shutter-release button halfway to start
live view. You can then press the shutter-release
button halfway to focus (autofocus mode only)
and press it all the way down to start or end
recording. The shutter-release button cannot be
used for other purposes while the live view
selector is rotated to 1. To end live view, press the
a button. The shutter-release button on an
optional wireless remote controller or remote
cord functions in the same way as the camera
shutter-release button.
Pressing the control has no effect.
Description
155
Menu Guide