Canon EOS-1D X Mark III Af Setting Manualbook page 4

Improved AF algorithm
AI Servo AF IV
The camera analyzes the subject and
optimizes the settings. Supports a variety
of scenes with automatic settings.
The main feature of the AF system on the EOS-1D X Mark
III is the use of the new AI Servo AF IV, with a new advanced
algorithm that has improved stability and automation. The
"AF Configuration Tool" in previous camera allowed users
to to select [Case 1] to [Case 6] according to the subject
and shooting scene, with the EOS-1D X Mark III, the cases
are consolidated into just four, and a new automatic [Case
A] setting has been included. Using [Case A], the camera
determines the shooting scene and automatically sets the
appropriate [Tracking sensitivity] and [Accel./decel. tracking]
setting. This makes it possible to accurately focus on a
wide range of subjects and shooting scenarios by simply
setting [Case A]. The AF control algorithm for moving
subjects has been improved. AF accuracy has been improved
even in scenes with heat haze*" or when "shooting a
subject moving away at high speed," both situations where
predictive computation was previously difficult and AF has
been unreliable so far.
AI Servo AF IV now includes a high level of AF accuracy
and tracking ability for a variety of subjects with different
movement characteristics.
* During viewfinder shooting.
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