Does any one have any tips on using this lens. I rented the EF 100-400mm f/4.5-5.6 L IS USM for the weekend to take to the NASCAR races at Talladega Alabama on saturday & sunday. In the past i have used the EF 70-200mm f/2.8 L IS USM + the 1.4 TC & occasionally the 2 TC. This time i would like to have a litte more reach and better image quality. I'll be sitting in the lower part of the upper grandstands, weather is going to be mostly sunny in the low 70's. The cars can be going near 200 MPH but they wont be that close most of the time as the track is a 2 1/2 mile tri oval, so they dont move as fast as you would think except when they are right in front of you. I'll be sitting in the middle of the tri oval and the closest would be approximately 200 feet or more. I have passes to pre race pit road, driver introductions and the hospitality Tents and will be taking my EF 24-105mm f/4 L IS USM for closer photos.
Any advice would be welcomed. Here is a photos i took back in 2009 @ 280mm.