Canon EOS 5D Mark III Instruction Manual page 364

Troubleshooting Guide
During Live View and movie shooting, a white
icon is displayed.
It indicates that the camera's internal temperature is high. If the white

< > icon displayed, the still photo's image quality may deteriorate. If
the red <E> icon is displayed, it indicates that the Live View or movie
shooting will soon be terminated automatically (p.215, 241).
Movie shooting terminates by itself.
If the card's writing speed is slow, movie shooting may stop

automatically. When the compression method is set to [IPB], use a CF
card with a reading/writing speed of at least 10 MB per sec., and a SD
card with a reading/writing speed of at least 6 MB per sec. When the
compression method is set to [ALL-I (I-only)], use a CF card with a
reading/writing speed of at least 30 MB per sec., and a SD card with a
reading/writing speed of at least 20 MB per sec. To find out the card's
reading/writing speed, refer to the card manufacturer's Web site (p.217).
If the movie shooting time reaches 29 min. 59 sec., the movie shooting

will stop automatically.
The ISO speed cannot be set for movie shooting.
If the shooting mode is <A/d/s/f/F>, the ISO speed will be set

automatically. In the <a> mode, you can freely set the ISO speed (p.224).
ISO 16000/20000/25600 cannot be set for movie shooting.
Under [z2: ISO speed range], if you set the [ISO speed range]'s

[Maximum] setting to [25600/H], the maximum ISO speed for manual ISO
speed setting will be expanded and then ISO 16000/20000/25600 can be
set. However, since shooting a movie at ISO 16000/20000/256000 may
result in much noise, it is designated as an expanded ISO speed (displayed
as [H]).
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or red E