Nikon D90 User Manual
If foreign matter can not be removed from the low-pass filter using the Clean image
sensor option in the setup menu (pg. 244), 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
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
J (60%), turn the camera off and insert a
fully-charged EN-EL3e battery or connect an optional EH-5a or EH-5 AC adapter.
Remove the lens.
Turn the camera off and remove the lens.
Lock mirror up for cleaning.
Turn the camera on. Highlight Lock mirror up
for cleaning in the setup menu and press
(note that this option is not available at battery
J or below).
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.
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 viewfinder display will turn off and the
control panel display will blink.
Examine the low-pass filter.
Holding the camera so that light falls on the
low-pass filter, examine the filter for dust or lint.
If no foreign objects are present, proceed to