Nikon D800 User Manual (en)

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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