Nikon D300 - Manual (Page 404)

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Use a Reliable Power Source
The shutter curtain is delicate and easily damaged. If the camera powers
off while the mirror is raised, the curtain will close automatically. To
prevent damage to the curtain, observe the following precautions:
• Do not turn the camera off or remove or disconnect the power source
while the mirror is raised.
• If the battery runs low while the mirror is raised, a beep will sound and
the self-timer lamp will blink to warn that the shutter curtain will close
and the mirror will be lowered after about two minutes. End cleaning or
inspection immediately.
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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 D300, 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.
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 version 1.3.5 or later or
Capture NX 2 version 2.1.0 or later (available separately; pg. 368) 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 Speedlights,
should be included when the camera is inspected or serviced.