Nikon D800 - Manual (Page 423)

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6
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 8.
7
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.
8
Turn the camera off.
The mirror will return to the down position and the shutter
curtain will close. Replace the lens or body cap.