Nikon D4 - Manual (Page 428)

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❚❚ Manual Cleaning
If foreign matter can not be removed from the low-pass filter using
the Clean image sensor (
0 399) 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. Turn the camera off and insert a
fully-charged EN-EL18 battery or connect an optional EP-6
power connector and EH-6b AC adapter.
2
Remove the lens.
Turn the camera off and remove the lens.
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).
G button