Nikon D6 Reference Manual page 772

Custom Settings menu option
[Customize i menu]
g1
g2 [Custom controls]
[Preview button]
[Fn1 button]
[Fn2 button]
[Fn3 button]
[Sub-selector center]
[Shutter-release button]
720
Defaults
Default
Set Picture Control,
White balance,
Frame size and rate/Image
quality,
Microphone sensitivity,
Wind noise reduction,
Metering,
Wired LAN/WT,
Electronic VR,
Autofocus mode,
AF-area mode,
Destination,
Custom controls
None
None
None
None
AE/AF lock
Take photos