Challenging AI Servo Autofocus

Challenging AI Servo Autofocus
I know there are lots of galloping horse pictures on the site, but there is a good reason for that. Because I can usually round up a rider and because galloping American quarter horses are very fast (called "World's Fastest Athlete" with some capable of over 50 mph), I have a consistently available and very challenging subject for testing camera and lens autofocus capabilities. Because I shoot this subject regularly, it is easier for me to differentiate the abilities of various DSLR cameras and lenses. Mix in some other scenarios and I can get a solid feel for a camera and lens' capabilities.
Camera and Lens Settings
300mm  f/2.8  1/1600s
ISO 160
3456 x 5184px
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