Andy Roddick Serve

I posted this photo of Roddick's serve for a few reasons:-The shadow is interesting (prob a better photo on its own)-The majority of the crowd has turned to watch the return before the ball is hitand-This is a good example of the 100-400IS being hand held at 400mm. Compared to the 400DO or 2.8 I don't think it seems very sharp but compared to a traditional non-IS 400mm being hand held I think it looks very good.