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diverhank wrote:
It's puzzling to me why you think that the autofocus works as you described. The AI Servo mode is supposed to continue to track the same target that you had locked (the AF point on it) then temporarily lose it. It is not meant to continue working as you switch target. If it works it's amazing but that's not its intended function. The way you and surfinrobin tested this, to me, seemed excessively beyond the norm. I haven't mentioned this until now because of the lack of response from FM'ers making me think I've got this all wrong before. My 50D and 5DIII with all of my lenses (70-200mm f/4L & 400mm f/5.6L - I haven't used AI servo with others) I can tell you, would fail this test. Edit: I forgot about my 100mm f/2.8L macro, it would fail too.
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Not sure what you are talking about. With the camera in AI Servo mode and the shutter button held down half-depressed, the lens should continuously change focus as the subject moves closer or further away. It has worked that way on every Canon, Sigma, and Tamron lens that I have owned in the last ten years.
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