Thanks Aaron, it's quite a work out with the Canon 100-400 lens. By the end of the show my wrist is pretty sore, getting to old I guess.
A photographer next to me was testing out the new Tamron 150-600mm, sells for $1069.00 compared to Canons $13,000.00 for their 600mm. He found the Tamron had problems focusing at the 600mm range, he did take a lot of nice shots.