Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 513)

513
Troubleshooting Guide
It indicates that the camera’s internal temperature is high. If the red
<
E > icon is displayed, it indicates that the movie shooting will soon
stop automatically (p.341).
If the card’s writing speed is slow, movie shooting may stop
automatically. For cards that can record movies, see page 316. To find
out the card’s writing speed, refer to the card manufacturer’s Web site.
If you shoot a movie for 29 min. 59 sec. or shoot a High Frame Rate
movie for 7 min. 29 sec., the movie shooting will stop automatically.
If you shoot with H 8 / 7 J , use a CFast card [ g ]. Even a
high-speed CF card [ f ] can only record a very short movie (approx.
10 sec. max.).
If the shooting mode is < d >, < s >, < f >, or < bulb >, the ISO speed
will be set automatically. In the < a > mode, you can freely set the ISO
speed (p.302).
If [ z 2: Highlight tone priority ] has been set to [ Enable ], the settable
ISO speed range will start from ISO 200. Even if you set [ Range for
movies ] or [ Range for H ] for ISO speed expansion, you cannot
select H, H1, or H2. When [ z 2: Highlight tone priority ] is set to
[ Disable ] (p.193), ISO 100/125/160 or an expanded ISO speed can be
set.
During movie shooting, the red E icon is displayed.
Movie shooting stops by itself.
The ISO speed cannot be set for movie shooting.
ISO 100 cannot be set or ISO speed expansion
cannot be selected during movie shooting.