Canon EOS-1D C Instruction Manual page 17

EF Cinema (CN-E) Lenses
With EF Cinema single focal length lenses, you can shoot at all movie-
recording quality settings. If you use an EF Cinema zoom lens, you can
shoot movies only with I Super 35mm Crop. (Since the image circle
is small, the image periphery will be dark if you shoot a movie in H A
B C quality or still photo.)
Cards that Can Record Movies
Use a large-capacity card with a fast writing/reading speed (required
card performance) as shown in the table. First, shoot a few test movies
to see if movies can be recorded accurately with a movie-recording size
you set (p.34).
Image Size Frame Rate
H
I
A
B
C
I
A
B
If you use a slow-writing card when shooting movies, the movie may not
be recorded properly. Also, if you play back a movie on a card with a
slow reading speed, the movie may not play back properly.
If you want to shoot still photos while shooting a movie, you will need an
even faster card.
To check the card's writing/reading speed, refer to the card
manufacturer's Web site.
To optimize the card's performance, format the card before shooting
movies. For card-formatting cautions, see zpage 55.
Movie Recording/
Compression Method
4
6/5/4
6/5/4
MPEG-4 AVC/H.264
8/7
6/5
6/5/4
8/7
MPEG-4 AVC/H.264
6/5/4
8/7
k Preparing to Shoot Movies
Motion JPEG
J
X
W
Required Card
Performance
UDMA7
100 MB/sec. or faster
20 MB/sec. or faster
10 MB/sec. or faster
30 MB/sec. or faster
60 MB/sec. or faster
30 MB/sec. or faster
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