Nikon D800 User Manual (en)

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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