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| p.1 #3 · p.1 #3 · 7D AI-Servo ... What is the Settling Time? |
It depends. Is the subject moving towards you, left to right, or somewhere in between? How fast? How much light do you have? What lens?
The idea with servo is that the subject to camera distance could be constantly changing, so you don't really have time to allow the AF to settle. Otherwise I would think you can use One Shot.
In general in good light with a fast focusing lens (especially one that's f/2.8 or faster so you activate the high-precision points), I've found that my 7D has little trouble keeping up with a moving object. Exceptions might be extreme examples, like a race car or aircraft moving straight at you.
As the lighting degrades, so will the AF performance (i.e. don't expect the same AI Servo performance shooting indoor sports as you would get outdoors in sunlight).
That said, in a 8 fps burst, the tougher the conditions, the number of frames in sharp focus will go down. With my 7D, often the first couple of frames are not in focus, particularly indoors. The 7D is still really good, and you probably would need to move to a 1-Series to do better.