Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 954)

Multiple exposures
Shooting method Function/control priority, Continuous shooting priority
Number of multiple exposures 2 to 9 exposures
Multiple-exposure control Additive, Average, Bright, Dark
HDR shooting (still photo HDR PQ)
Recording format HEIF
Bit depth 10-bit
Color sampling YCbCr 4:2:2
HDR specification ITU-R BT.2100 (PQ)
Shutter
Type Electronically controlled, focal-plane shutter
Shutter mode
Viewfinder shooting: Mechanical
Live View shooting: Mechanical, Electronic 1st-curtain, Electronic
Shutter speed
Mechanical/Electronic 1st-curtain set: 1/8000 sec. to 30 sec., Bulb
Electronic set: 1/8000 sec. to 0.5 sec.
Max. shutter speed with flash sync: 1/250 sec.
* Setting range differs when recording movies
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