Like you, I started this passion for wildlife and I have been using the 100-400L for almost 3 years and love it, But since I am set at 400mm 99.9 of the time ---in hindsite, I would go with the 400L 5.6 prime, as FastGlass said. It has better IQ, is smaller and it has a really cool sliding shade. If there is any doubt, look at some of the bird shots that Nate took with his 400L. Good luck
Bob




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