Panning at it's very best. What technique do you use? I always tried to judge a point forward of where they would pass and lock the focus there. Then with the shutter set I'd pan along opening the shutter just before they got to that point. Had a high hit rate. The 5D wasn't the best at predictive AF.
Thanks John. Basically I use manual exposure making the shutter speed appropriate, at the speed these bikes are going 1/90th works well. I use type 2 IS on my Canon lens, focus is set to AIServo and drive continuous. From there I just follow the subject and fire off a burst as he passes closest to me. While I used my D1 MkIIN for these I have used my 5D successfully in the past employing the same method. The photograph below was shot with my 5D.
Some tips would include using the fastest shutter possible that still results in an acceptable motion blur, of course the quicker the subject is moving the faster a shutter you can use. Also a long lens will create blur at a faster shutter speed than a wide lens and the closer the subject is to the background the greater the blur will be at any given shutter speed.
