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Beautiful shots Tony! I love seeing what birders can do with this camera; there really is nothing like it.
But I do have to mention one thing- even in the down-sampled crops, the noise that has been processed out just stands out so much to me. It kills me to see the same noise that I had to process out of my 60D shots (destroying detail in the 'process') in such great captures, and it makes me wish Nikon had a comparable cropper and lenses to back up.
It's one of those 'what has been seen cannot be unseen' kind of things I guess . I wonder if the older 1D's suffer as much? I'd think that the 1D IV would be better, but what about the 1D III that the OP is considering?