Canon EOS-1DX Af Setting Manualbook page 86

Improved low-light AF
performance and
expanded parameter
characteristics during
continuous shooting
Improved AI Servo AF low-light
performance through a new algorithm
Visualization of low-light performance
Low-light
performance
During halfway press
of shutter button
Low-light
performance
During halfway press
of shutter button
Low-light performance for the first frame of AI Servo AF
and while holding down the shutter button halfway is
improved through a modified algorithm.
At default settings, low-light performance is the same as
the previous firmware for the second frame and later.
Firmware V1.X
0 1
1st shot 2nd shot
Firmware V2.0
Improved
0 1
1st shot 2nd shot
86
2 3
3rd shot
2 3
3rd shot