Nikon D800 - Manual (Page 419)

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Select Clean now.
Highlight Clean now and
press
J. The camera will
check the image sensor
and then begin cleaning.
This process takes about
ten seconds; during this
time, 1 is displayed in
the control panel and other
operations can not be
performed. Do not remove
or disconnect the power
source until cleaning is
complete and 1 is no
longer displayed.
J button