Nikon Df - Manual (Page 357)

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Notes on the monitor : The monitor is constructed with extremely high
precision; at least 99.99% of pixels are effective, with no more than 0.01%
being missing or defective. Hence while these displays may contain pixels
that are always lit (white, red, blue, or green) or always off (black), this is
not a malfunction and has no effect on images recorded with the device.
Images in the monitor may be difficult to see in a bright light.
Do not apply pressure to the monitor, as this could cause damage or
malfunction. Dust or lint on the monitor can be removed with a blower.
Stains can be removed by wiping lightly with a soft cloth or chamois
leather. Should the monitor break, care should be taken to avoid injury
from broken glass and to prevent liquid crystal from the monitor touching
the skin or entering the eyes and mouth.
Batteries : Batteries may leak or explode if improperly handled. Observe the
following precautions when handling batteries:
• Use only batteries approved for use in this equipment.
• Do not expose the battery to flame or excessive heat.
• Keep the battery terminals clean.
• Turn the product off before replacing the battery.
• Remove the battery from the camera or charger when not in use and
replace the terminal cover. These devices draw minute amounts of
charge even when off and could draw the battery down to the point
that it will no longer function. If the battery will not be used for some
time, insert it in the camera and run it flat before removing it and storing
it in a location with an ambient temperature of 15 °C to 25 °C (59 °F to
77 °F; avoid hot or extremely cold locations). Repeat this process at least
once every six months.
• Turning the camera on or off repeatedly when the battery is fully
discharged will shorten battery life. Batteries that have been fully
discharged must be charged before use.
• The internal temperature of the battery may rise while the battery is in
use. Attempting to charge the battery while the internal temperature is
elevated will impair battery performance, and the battery may not
charge or charge only partially. Wait for the battery to cool before
charging.