Nikon D6 Reference Manual page 1052

Problems and Solutions
Solutions to some common issues are listed below.
Battery/Display
The camera is on but does not respond:
●
•
Wait for recording and other operations to end.
•
If the problem persists, turn the camera off.
•
If the camera does not turn off, remove and reinsert the battery.
•
If you are using an AC adapter, disconnect and reconnect the AC
adapter.
- Any data currently being recorded will be lost.
- Data that have already been recorded are not affected by
removing or disconnecting the power source.
The viewfinder is out of focus:
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•
Rotate the diopter adjustment control to adjust viewfinder focus.
•
If adjusting viewfinder focus does not correct the problem, set the
autofocus mode to AF-S and the AF-area mode to [Single-point
AF]. Next, select the center focus point, choose a high-contrast
subject, and focus using autofocus. With the camera in focus, use
the diopter adjustment control to bring the subject into clear focus
in the viewfinder.
•
If necessary, viewfinder focus can be further adjusted using optional
corrective lenses.
1000 Problems and Solutions