Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 372)

AI Servo 2nd image priority
With AI Servo AF for continuous shooting, you can preset the AF operation characteristics
and shutter-release timing for the subsequent shots after the first shot in continuous
shooting.
[0] Equal priority
Equal priority is given to focusing and continuous shooting speed. In low light or with
low-contrast subjects, continuous shooting speed may slow down.
[–2]/[–1] Shooting speed priority
Priority is given to the continuous shooting speed instead of achieving focus. –2
maintains fast continuous shooting better than –1.
[+2]/[+1] Focus
Priority is given to achieving focus instead of the continuous shooting speed. The picture
will not be taken until focus is achieved. +2 enables easier focusing than +1 in low-light
conditions, but continuous shooting may be slower under these conditions.
Caution
Even if [ -1 ] or [ -2 ] is set, shooting conditions that activate flicker reduction ( ) may
cause slower continuous shooting or an inconsistent interval between shots.
Note
If the camera cannot focus in low-light conditions when set to [ 0 : Equal priority ],
try setting to [ +1 ] or [ +2 ].
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