Speaking of Canon Custom Functions . . .
C.Fn 20 allows you to adjust AI servo tracking sensitivity, with two upward adjustments from "standard" to "moderately fast" and "fast". The manual says that those upward adjustments are "effective when you want to consecutively photograph multiple subjects located at random distances". I get that, but wouldn't it also generally be advantageous to have faster AI servo tracking for any moving subjects as in sports photography? What's the DOWNSIDE in speeding up AI Servo tracking sensitivity?
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