Nikon D800 User Manual (en)

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3
Select Lock mirror up 
for cleaning.
Turn the camera on and 
press the 
G button to 
display the menus. 
Highlight Lock mirror up 
for cleaning
 in the setup menu and press 
2 (note that this 
option is not available at battery levels of J or below).
4
Press 
J.
The message shown at right will be 
displayed in the monitor and a row of 
dashes will appear in the control panel 
and viewfinder. To restore normal 
operation without inspecting the low-
pass filter, turn the camera off.
5
Raise the mirror.
Press the shutter-release 
button all the way down. 
The mirror will be raised and 
the shutter curtain will open, 
revealing the low-pass filter. The display in the viewfinder will 
turn off and the row of dashes in the control panel will blink.
G button