Nikon D750 User Manual page 397

Option
If image quality is set to JPEG fine, JPEG normal,
or JPEG basic, e will be displayed in the
viewfinder and an NEF (RAW) copy will be
recorded with the next picture taken after the Fn
e + NEF (RAW) button is pressed (the original image quality
setting will be restored when you remove your
finger from the shutter-release button). To exit
without recording an NEF (RAW) copy, press the
Fn button again.
a Live view Pressing the Fn button starts and ends live view.
The wireless remote controller Fn button
Same as camera
x performs the same function as the camera Fn
Fn button
button (0 356).
The wireless remote controller Fn button
Same as camera
y performs the same function as the camera Pv
Pv button
button (0 361).
The wireless remote controller Fn button
Same as camera
z performs the same function as the camera
4 button
A AE-L/AF-L button (0 361).
None Pressing the button has no effect.
Description
369