Nikon D300 User Manual (en)

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4
Raise the mirror.
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.
5
Examine the low-pass filter.
Holding the camera so that light falls on 
the low-pass filter, examine the filter for 
dust or lint. If no foreign objects are 
present, proceed to Step 7.
6
Clean the filter.
Remove any dust and lint from the filter 
with a blower. Do not use a blower-
brush, as the bristles could damage the 
filter. 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.
7
Turn the camera off.
The mirror will return to the down position and the shutter 
curtain will close. Replace the lens or body cap.