Nikon D3X D3X User's Manual - Page 426

The Low-Pass Filter The 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. 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 J (60%), turn the camera off and insert a fully-charged EN-EL4a battery or connect an optional EH-6 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 (pg. 346) 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 top control panel and viewfinder. To restore normal operation without inspecting the low-pass filter, turn the camera off. n 400