I've been asked to shoot a surfing competition at the end of the month.
I'm going to rent a lens, but I'm not sure which way to go. I need to keep it reasonably priced, so I'm looking at either the 400mm f/5.6 or the 100-400mm IS.
I'll have two bodies. I'm thinking I'll put the rented lens, whichever one it is, on my 40D, and use the 24-70mm f/2.8 on my 5D for spectator stuff, etc.
My gut tells me that the 400mm prime is going to be sharper than the 100-400mm at 400mm.
Suggestions?
Thanks!