Canon 5D Mark III User Manual (en)

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A Fully Automatic Shooting (Scene Intelligent Auto)
66
 
The shutter speed display is blinking.
Since it is too dark, taking the picture may result in a blurred subject due 
to camera shake. Using a tripod or a Canon EX-series Speedlite (p.188) 
(sold separately) is recommended.
 
When flash was used, the bottom part of the picture came out 
unnaturally dark.
If a hood is attached to the lens, it can obstruct the flash coverage. If the 
subject is close, detach the hood before taking the picture with flash.