Nikon D6 Reference Manual page 905

Role
[AE lock (Reset
D
on release)]
C
[AE lock only]
B
[AE/AF lock]
r [FV lock]
[ N Disable/
h
enable]
q [Preview]
Exposure locks when the control is pressed.
Exposure remains locked until the control is
pressed a second time, the shutter is released, or
the standby timer expires.
Exposure locks while the control is pressed.
Focus and exposure lock while the control is
pressed.
Press the control to lock flash value for optional
flash units; press again to cancel FV lock.
If the flash is currently enabled, it will be
disabled while the control is pressed. If the flash
is currently off, front-curtain sync will be selected
while the control is pressed.
•
Viewfinder photography: Hold the control to
stop aperture down and preview depth of
field.
•
Live view: Press the control to stop aperture
down and preview focus. Press the control
again to restore the previously-selected
aperture value.
A Custom Settings: Fine-Tuning Camera Settings
Description
853