Nikon D300 User Manual (en)

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❚❚Manual Cleaning
If foreign matter can not be removed from the low-pass filter using 
the [Clean image sensor] (pg. 373) option in the setup menu, the 
filter can be cleaned manually as described below. Note, however, 
that the filter is extremely delicate and easily damaged. Nikon 
recommends that the filter be cleaned only by Nikon-authorized 
service personnel.
1
Charge the battery or connect an AC adapter.
A reliable power source is required when inspecting or 
cleaning the low-pass filter. If the battery level is below 
(60 %), turn the camera off and insert a fully-charged EN-EL3e 
battery or connect an optional EH-5a or EH-5 AC adapter.
2
Select [Lock mirror up for cleaning].
Remove the lens and turn the camera on. 
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).
3
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.