Canon EOS-1D X Mark III Advanced User's Manual page 952

External Speedlite
Compatible Speedlites
Flash metering
Flash exposure compensation
FE lock
PC terminal
Flash control
Movie recording
Normal movies
RAW movies
Movie recording size
Frame rate
Compression method
EL/EX series Speedlites
E-TTL II autoflash
±3 stops in 1/3- or 1/2-stop increments
Available
Available
Flash function settings, Flash Custom Function settings
Recording format
Compression
Video signal recording range
Color sampling
Color Matrix
ALL-I/IPB
Audio
IPB (Light)
* AAC or Linear PCM can be selected in [C.Fn7-7: Audio compression]
Recording format
Audio
RAW (5472×2886), 4K DCI (4096×2160), 4K DCI cropped (4096×2160), 4K
UHD (3840×2160), Full HD (1920×1080)
119.9p/59.94p/29.97p/24.00p/23.98p (with NTSC)
100.0p/50.00p/25.00p/24.00p (with PAL)
* 119.9p/100.0p used for High Frame Rate movies
ALL-I (For editing), IPB (Standard), IPB (Light)
952
Canon Log
OFF
MP4
MPEG-4 H.264/AVC MPEG-4 H.265/HEVC
Full range (0–255) Full range (128–1016)
YCbCr 4:2:0 (8-bit)
Rec.ITU-R BT.709 Rec.ITU-R BT.709/BT.2020
AAC/Linear PCM*
AAC
OFF
ON
YCbCr 4:2:2 (10-bit)
Canon Log
ON
RAW (12-bit)
Linear PCM