Canon EOS-1D C - Manual (Page 70)

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This indicates that the camera’s internal temperature is high. If the
white <
> icon is displayed, still photo image quality may deteriorate.
If the red icon is displayed, movie shooting will soon stop
automatically (p. 55).
If the card’s writing speed is slow, movie shooting may stop
automatically. See page 17 for the writing/reading speed required
(Required Card Performance) for the respective movie-recording
quality. To find out the card’s writing/reading speed, refer to the card
manufacturer’s website.
Shoot a few test movies to see if movies can be recorded accurately
with a movie-recording size you set (p.34) on the card.
If the shooting mode is BULB>, the ISO speed will be set
automatically. In the mode, you can freely set the ISO speed
(p.24).
Under [z2: ISO speed settings], if [ISO speed range]’s [Maximum]
is set to [51200/H] or higher, the manual setting range’s maximum will
be expanded to enable ISO 32000/40000/51200 to be set. However,
since movie shooting at ISO 32000/40000/51200 may result in
substantial noise, the expanded ISO speed (“H” displayed) will be
used.
Troubleshooting Guide
A white icon or red E icon is displayed.
Movie shooting stops by itself.
The ISO speed cannot be set.
ISO 32000/40000/51200 cannot be set.