Nikon D6 Reference Manual page 249

•
If you are using autofocus, you
should also confirm that the in-
focus indicator ( I ) is displayed.
3
Keeping the center of the sub-
selector pressed, recompose
the photograph and shoot.
A
Locking Exposure with the Shutter-Release Button
If [On (half press)] is selected for Custom Setting c1 [Shutter-release
button AE-L], exposure will lock while the shutter-release button is
pressed halfway.
Exposure-Related Settings (Metering and Exposure Compensation)
197