For the race itself I'll be in grandstand 6a but on Friday practice I can go anywhere which is when I plan on getting some good shots. I'll for sure be using my 70-200 f/4L IS and 17-40. For anyone who has been will I need more reach to get any decent pics? I was thinking about maybe renting a 400 f/5.6 or getting a 1.4x extender, any advice would be appreciated.

