Nikon Df - Manual (Page 360)

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Troubleshooting
If the camera fails to function as expected, check the list of
common problems below before consulting your retailer or Nikon-
authorized service representative.
Battery/Display
The camera is on but does not respond : Wait for recording to end. If the problem
persists, turn the camera off. If the camera does not turn off, remove and
reinsert the battery or, if you are using an AC adapter, disconnect and
reconnect the AC adapter. Note that although any data currently being
recorded will be lost, data that have already been recorded will not be
affected by removing or disconnecting the power source.
Viewfinder is out of focus : Adjust viewfinder focus or use optional eyepiece
correction lenses (0 28, 324).
Viewfinder is dark : Insert a fully-charged battery (0 18, 29).
Displays turn off without warning : Choose longer delays for Custom Setting c2
(Standby timer) or c4 (Monitor off delay) (0 251, 253).
Control panel and viewfinder displays are unresponsive and dim : The response times
and brightness of these displays vary with temperature.
Fine lines are visible around active focus point or display turns red when focus point is
highlighted
: These phenomena are normal for this type of viewfinder and
do not indicate a malfunction.