Nikon D300 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
Display the [Clean image 
sensor] menu.
Highlight [Clean image sensor] 
in the setup menu and press 
2.
A
Image Sensor Cleaning
If the options described in this section are not sufficient to remove dust or 
other foreign objects from the image sensor, clean the sensor manually as 
described on page 376.