AI Servo vs AI Focus ?

Started Apr 24, 2010 | Discussions thread
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ctny
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AI Servo vs AI Focus ?
Apr 24, 2010

Can someone explain when you would chose one mode over another? It seems while technically AI Focus can detect if a stationary objects starts moving, both modes will continuously determine focus while shutter is half pressed and set final focus only when the shutter is fully pressed. This seems to mean both modes can shot a bird in flight and a street sign equally well (of course using AI Servo to shoot a street sign "wastes" its capability)...

In case it matters, I have a 7D, not sure it behaves any differently than other models...

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