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Oh and find out from the powers that be what you are and aren't allowed to do photographywise before you go and get it in writing and carry it with you just incase you get a jobsworth. In your position, though I'd definitely hire a 7D and a 100 - 400L It's not the fastest lens in the world - f/5.6 at the fast end but you'll have better low light capability and still keep the crop camera Field of view when combined with the 7D. Other lens options are Tamron or Sigma 200 - 500 which would get you 320 - 800mm, but these would be f/6.3 at maximum zoom. The f/2.8 Sigma is super expensive but may be available to hire.
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