Originally Posted by
GadgetFreak
I would second or third the recommendation for the 100-400mm f4.5/5.6L lens. I used it extensively for wildlife photography and it was fantastic. While there were a few times I wished I had a 600mm lens, overall it was a great lens that was really sharp and not as big as a 600.
At one of the Cleveland Grand Prix races, one of the Sport's Illustrated photographers let me "Play" with his 600 and 1200 for a few hours while we were in one of the media photo areas of the track. The images were incredible, but the lenses were so heavy, that even with a mono-pod, they were extremely difficult to use.
BTW, the 1200L was (I don't know if still made) a special order lens that cost more than many cars at the time