I just got the 100-400mm IS and yesterday was my first good weather opportunity to use it. I was at the Viera Wetlands in Brevard County, Florida. All shots were with Canon XT, ISO 200, handheld.
The first shot, the least bittern, is 400mm, F/6.3, 1/500.
The second, the heron, is 400mm, F/5.6, 1/800.
There will be a learning period for me with this lens, but I was pleased with the results.
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