Nikon D4S - Manual (Page 445)

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Foreign Matter on the Low-Pass Filter
Nikon takes every possible precaution to prevent foreign matter from
coming into contact with the low-pass filter during production and
shipping. The D4S, however, is designed to be used with
interchangeable lenses, and foreign matter may enter the camera when
lenses are removed or exchanged. Once inside the camera, this foreign
matter may adhere to the low-pass filter, where it may appear in
photographs taken under certain conditions. To protect the camera
when no lens is in place, be sure to replace the body cap provided with
the camera, being careful to first remove all dust and other foreign
matter that may be adhering to the body cap. Avoid exchanging lenses
in dusty environments.
Should foreign matter find its way onto the low-pass filter, clean the filter
as described above, or have the filter cleaned by authorized Nikon service
personnel. Photographs affected by the presence of foreign matter on
the filter can be retouched using Capture NX 2 (available separately;
0 411) or the clean image options available in some third-party imaging
applications.
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Servicing the Camera and Accessories
The camera is a precision device and requires regular servicing. Nikon
recommends that the camera be inspected by the original retailer or
Nikon service representative once every one to two years, and that it be
serviced once every three to five years (note that fees apply to these
services). Frequent inspection and servicing are particularly
recommended if the camera is used professionally. Any accessories
regularly used with the camera, such as lenses or optional flash units,
should be included when the camera is inspected or serviced.