I know that one would adjust to either of those situations accordingly but I would like to "kill" two birds with one stone. I'm researching birding / sport setup which should be my last long-lens purchase .... at least for a very long while. I got some excellent feedback from Frank "Flew" which got me started. I'm looking into the following: 1. 200-400 2. 400 f/2.8 II 3. 500 f/4 II Please share your opinions and suggestions. I know that some of those topics have been covered on other websites but I guess I need reassurance from more people. Some questions: 1. Which lens would you prefer - money is an object 2. Which tripod ? 3. Which bulkhead ? 4. Sidekick or Head ? 5. US or IMPORTED lens ? The more expensive lens, the bigger difference in $ between where made. I really don't see any difference when I talk to people about this subject. Thanks in advance !