300D vs. 10D (reply from old board thread)

[Photo-John]

Well, it probably depends on the camera. But with the EOS 3, the 10D, and the 1D, with the right lenses, AI-Servo allows you to lock right onto your subject and track super accurately. If I know I can keep my subject on the middle focus point and I'm not sure exactly where I want to take the picture, AI-Servo is awesome. It might not work as well with the Digital Rebel, though. I used to have an A2E and I noticed a big improvement when I upgraded to an EOS 3. So the camera body definitely makes a difference.

Anyway, I'm pretty sure I shot this photo with AI-Servo on. If I wasn't using AI-Servo, it was still on and I had my thumb on the CF button to lock the focus. It was taken with the EOS 1D and 70-200 f/2.8L.