How Are AF Accuracy/Hunting Issues Related to the Lens (and not the Camera)?

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DigitalPhilosopher
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How Are AF Accuracy/Hunting Issues Related to the Lens (and not the Camera)?
3 months ago

Working with a Tamron 70-200 f/2.8 - a lens rather notorious for its AF hunting characteristics - I thought of something:

Why does AF accuracy or hunting depend on a lens? I mean, isn't the camera that gives the command to a lens focus motor to turn, then once the camera AF system believes it has acquired focus, it tells the lens motor to stop turning?

I understand that focus speed could depend on the lens, but what about the rest? The only thing I can think of, is that there is a lag between the moment a lens is told to stop turning the motor, until it actually does so, thus passing the in-focus area. Is that the case?

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