[Blue]

Thanks everybody. I'll take it that it as it being the normal characteristics for this lens since it shows up in the RAW file also.
Thanks for the link borno. I haven't read through it yet, I will go back and read it when I have more time.

I was going to suggest looking at the RAW file since that could rule out jpeg compression artifacts and apparently is not. It seem that Alohadave and Creampuff have the best explanation.

As far as defining good bokeh or bad, its a lot like defining pornography vs. art.