The Low-Pass FilterThe image sensor that acts as the camera’s picture element is fitted with a low-pass filter to prevent moiré. If you suspect that dirt or dust on the filter is appearing in photographs, you can clean the filter 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.
1A reliable power source is required when inspecting or cleaning the low-pass filter. If
the battery level is
or below or the camera is powered by an optional MB-D80 battery pack with AA batteries, turn the camera off and insert a fully-charged EN-EL3e battery or connect an optional EH-5 AC adapter.
2Remove the lens and turn the camera on. Press the MENU button to display the camera menus and select Mirror lock-up from the setup menu (note that this option is not available at
battery levels of 
or below, while recording a multiple ex- posure, or when using an optional MB-D80 battery pack with AA batteries). The menu shown at right will be displayed.
3Highlight On and press OK. 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.
4 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.
5Holding the camera so that light falls on the low-pass filter, examine the filter for dust or lint. If no foreign objects are pres-
ent, proceed to Step 7.
6Remove any dust and lint from the filter with a blower. Do not use a blower-brush, as the bristles could damage the fil-
ter. Dirt that can not be removed with a blower can only be removed by Nikon-authorized service personnel. Under no circumstances should you touch or wipe the filter.
Technical Notes / Caring for the Camera 125