I've had the 400 5.6 for a long time and never had any issues, but a birder friend asked me to try his, because he feels there might be something wrong with it. I slapped it on my 7D and got a nice shot of my resident neighborhood Cooper's Hawk. While I feel like the focus is OK, there seems to be something going on with the purple-and-green coloration on the branches. Is this a problem with the lens? (Fringing? I seem to recall hearing about that.)
The picture's been cropped and downscaled, but I've left the colors alone.
As for the focus, this was a distant bird filling maybe 1/10th of the frame; considering that, I think it's ok, right? Mine might do a little better, but it's hard to say.
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