Nikon D720, Руководство пользователя

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Foreign Matter on the Image Sensor
Foreign matter entering the camera when lenses or body caps are
removed or exchanged (or in rare circumstances lubricant or fine
particles from the camera itself ) 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 camera
mount, lens mount, and body cap. Avoid attaching the body cap or
exchanging lenses in dusty environments.
Should foreign matter find its way onto the image sensor, use the
image sensor cleaning option as described on page 321. If the
problem persists, clean the sensor manually (
0 324) 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.
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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-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.