Nikon D4 - Manual (Page 434)

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Caring for the Camera and
Battery: Cautions
Do not drop : The product may malfunction if subjected to strong shocks or
vibration.
Keep dry : This product is not waterproof, and may malfunction if immersed
in water or exposed to high levels of humidity. Rusting of the internal
mechanism can cause irreparable damage.
Avoid sudden changes in temperature : Sudden changes in temperature, such as
those that occur when entering or leaving a heated building on a cold day,
can cause condensation inside the device. To prevent condensation, place
the device in a carrying case or plastic bag before exposing it to sudden
changes in temperature.
Keep away from strong magnetic fields : Do not use or store this device in the
vicinity of equipment that generates strong electromagnetic radiation or
magnetic fields. Strong static charges or the magnetic fields produced by
equipment such as radio transmitters could interfere with the monitor,
damage data stored on the memory card, or affect the product’s internal
circuitry.
Do not leave the lens pointed at the sun : Do not leave the lens pointed at the sun
or other strong light source for an extended period. Intense light may
cause the image sensor to deteriorate or produce a white blur effect in
photographs.