Umpires are generally advised to call infield flies at the peak of the "pop up".... this will give the umpires an idea of where the ball will land.
If you call it immediately, it is hard to judge where the ball is going to go.
True Story: A couple of years ago, I was playing (I play as well as umpire)..... and the base umpire called an infield fly the minute my teammate hit the ball. It was a high fly ball, but it was not caught by anyone, not even RF, who had to chase the ball as it took it's first hop about 10 feet short of the right field warning track
Again... stressing the importance of judging an infield fly at the peak of the hit.
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