Canon EOS-1D X Mark III Advanced User's Manual page 926

Guide to image size settings (approx.)
Image Size Pixels Recorded
JPEG
20 M
13 M
8.9 M
5.0 M
HEIF
20 M
RAW
20 M
20 M
RAW+JPEG
20 M
20 M
20 M
20 M
RAW+HEIF
20 M
20 M
20 M
20 M
• Number of shots available and maximum burst as measured in viewfinder shooting with
a 325 GB card conforming to Canon testing standards.
• Varies depending on shooting conditions (such as when JPEG/HEIF image quality is set
to 8, as well as the subject, memory card brand, ISO speed, Picture Style, and Custom
Functions).
File Size (MB)
7.6 40650
5.4 56960
4.1 74070
2.8 109110
7.6 39650
22.1 14150
13.1 27560
22.1
10500
7.6
13.1
16420
7.6
24.3
9620
7.6
13.7
14380
7.6
926
Available Shots
1,000 or more
1,000 or more
1,000 or more
1,000 or more
1,000 or more
1,000 or more
1,000 or more
1,000 or more
1,000 or more
350
420
Maximum Burst