Nikon D810 - Manual (Page 475)

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D
Foreign Matter on the Image Sensor
Nikon takes every possible precaution to prevent foreign matter from
coming into contact with the image sensor during production and
shipping. The D810, 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 image sensor, 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 image sensor, clean the
sensor as described above, or have the sensor cleaned by authorized
Nikon service personnel. Photographs affected by the presence of
foreign matter on the sensor can be retouched using the clean image
options available in some 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-authorized 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.