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

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Troubleshooting Guide
 
If a card error message is displayed, see page 48 or 573.
 
CF cards with a capacity greater than 128 GB and SDXC cards 
are formatted in exFAT. This means that if you format a card with 
this camera and then insert it into another camera, an error may 
be displayed and it may not be possible to use the card.
 
Set [z4: Mirror lockup] to [Disable].
 
Set the lens’s focus mode switch to <AF> (p.55).
 
Press the shutter button gently to prevent camera shake (p.57, 
58).
 
If the lens has an Image Stabilizer, set the IS switch to <1>.
 
In low light, the shutter speed may become slow. Use a faster 
shutter speed (p.246), set a higher ISO speed (p.177), use flash 
(p.286), or use a tripod.
 
See “Minimizing Blurred Photos” on page 96.
The card cannot be used.
An error message is displayed when 
the card is inserted in another camera.
I have to press the shutter button twice 
completely to take a picture.
The image is out of focus or blurred.