I'm going to be in Seattle for SeaFair and I want to rent a lens to get pics of the airshow and hydroplane races. I was thinking the 70-200mm F/2.8L IS, would that be satisfactory for shooting from the lakeside? Also, I looked around and found like 3 shops, and http://www.glazerscamera.com/rentals.html seemed the cheapest. Are there any better places to rent? cliffs: 1. 70-200mm F/2.8L IS good enough for airshow and hydroplane pics? 2. Glazer's Camera best place to rent?