Both the still and video AF performance are different in almost all the camera. Here is one of the video AF with

– CANON EOS R6, CANON EF 500mm F4 IS2, CANON 1.4x, CANON EF=EOS-R adapter

– Tripod

– AF method  : the only method using Full sensor area in R6

+Tracking

– Subject to detect : Animals ; Eye detection : On

 

 

The AF seem slower lock focus to the object compare to still AF. which normally require 1-4 seconds to lock the object. After locked focus, the tracking seem work well but still 20-40% chance lost focus especially bird eye/head not detectable. But it will get the object refocus very fast as long as we able to follow the bird movement.

 

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