Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - 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]. 372