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Message: <blockquote data-quote="J-see" data-source="post: 420821" data-attributes="member: 31330">I encounter this problem often when shooting birds. I shoot a lot at the canal here and at the other side are trees. If for some reason I mess up and the focus locks on the trees in the distance, I can keep the focal point on the bird as as perfect as possible, it won't focus until the duration of the lock I set has passed.One thing I learned by now is not to push the AF button until I am certain I have my subject where I want it. I usually track it with my lens not concerning myself with it being out of focus and only when it's in the range I want, I will activate auto-focus. That way I avoid an incorrect lock or my system having to catch up with the bird.It will work the same for airplanes I think. With auto-focus, too early is never that beneficial.</blockquote>