Nikon D750 DSLR Camera (Body Only) - Manual (Page 121)

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M : Manual
In manual exposure mode, you control both shutter speed and
aperture. While the exposure meters are on, rotate the main
command dial to choose a shutter speed, and the sub-command
dial to set aperture. Shutter speed can be set to “
v ” or to
values between 30 s and 1 /
4000
s, or the shutter can be held open
indefinitely for a long time-exposure ( A or % , 0 95).
Aperture can be set to values between the minimum and
maximum values for the lens. Use the exposure indicators to
check exposure.
Sub-command dial
Aperture
Shutter speed
Main command dial