Nikon D4 - Manual (Page 425)

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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 using the Clean image sensor option in the setup menu. The
filter can be cleaned at any time using the Clean now option, or
cleaning can be performed automatically when the camera is
turned on or off.
❚❚ “Clean Now”
1
Place the camera base down.
Image sensor cleaning is most effective
when the camera is placed base down as
shown at right.
2
Select Clean image
sensor in the setup
menu.
Press G to display the
menus. Highlight Clean
image sensor in the setup
menu and press
2.
G button