Nikon D6 Reference Manual page 931

g2: Custom Controls
Choose the functions performed either by pressing camera
controls or by pressing controls and rotating command dials
during filming.
•
Choose the roles played by the controls
below. Highlight the desired control
and press J .
0 [Preview button]
v [Fn1 button]
x [Fn2 button]
z [Fn3 button]
8 [Sub-selector center]
G [Shutter-release button]
G button U A Custom Settings menu
Option
A Custom Settings: Fine-Tuning Camera Settings 879