5D2 - Motorsport

Here are a few from this summers Silverstone Classic, shot with 5D2, Contax Zeiss 35 1.4 and 100-400L: http://rcyoung.co.uk/Sports-Cars

Feedback would be much appreciated

Also keen to know how many people shoot motorsport with their 5D2 and how they get on with focus accuracy? I'm not sure if its partly the 100-400 but the focus was definitely iffy

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www.rcyoung.co.uk