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D 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 D4, 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
393) or the clean image options available in some third-party imaging
applications.
D 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.