Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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Handling Precautions
26
 
Do not block the mirror operation with your finger, etc. Doing so may cause a 
malfunction.
 
Use only a commercially-available blower to blow away dust when it adheres 
to the lens, viewfinder, reflex mirror, focusing screen, etc. Do not use 
cleaners that contain organic solvents to clean the camera body or lens. For 
stubborn dirt, take the camera to the nearest Canon Service Center.
 
Do not touch the camera’s electrical contacts with your fingers. This is to 
prevent the contacts from corroding. Corroded contacts can cause camera 
malfunction.
 
If the camera is suddenly brought in from the cold into a warm room, 
condensation may form on the camera and internal parts. To prevent 
condensation, first put the camera in a sealed plastic bag and let it adjust to 
the warmer temperature before taking it out of the bag.
 
If condensation forms on the camera, do not use the camera. This is to avoid 
damaging the camera. If there is condensation, remove the lens, card and 
battery from the camera, and wait until condensation has evaporated before 
using the camera.
 
If the camera will not be used for an extended period, remove the battery 
and store the camera in a cool, dry, well-ventilated location. Even while the 
camera is in storage, press the shutter button a few times once in a while to 
check that the camera is still working.
 
Avoid storing the camera where there are chemicals that result in rust and 
corrosion such as in a chemical lab.
 
If the camera has not been used for an extended period, test all its functions 
before using it. If you have not used the camera for some time or if there is 
an important shoot such as a foreign trip coming up, have the camera 
checked by your nearest Canon Service Center or check the camera 
yourself and make sure it is working properly.
 
If you repeat continuous shooting or perform Live View shooting or movie 
shooting for a prolonged period, the camera may become hot. This is not a 
malfunction.
 
If there is a bright light source inside or outside the image area, ghosting 
may occur.