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Having owned/used a wide variety of fast telephotos I've got to say the line bokeh isn't that bad, possibly because it a slower lens with a smaller front objective diameter. It varies with distance to background and the pattern of the background.
It's the image that's important, not the tools used to make it.
I see what you mean about the bokeh but it takes nothing away from the subject, which is excellent.
John
"A hundredth of a second here, a hundredth of a second there � even if you put them end to end, they still only add up to one, two, perhaps three seconds, snatched from eternity." ~ Robert Doisneau
I am not 100% sure if it the bokeh is caused by the lens or post processing.
Do you shoot with raw and jpeg. It would show you if there is a difference. And how much cropping and squeezing for the Internet did you do? That could be a factor.
But you can spend too much energy looking for problems - I'd relax and enjoy the wildlife - and just take more pictures. thank you for sharing them with us.
One is sharpening before running NR and the second is I am cropping the image too much. Here's a picture with NR run prior to sharpening and not cropped as heavily. The lines are barely noticeable.
Having owned/used a wide variety of fast telephotos I've got to say the line bokeh isn't that bad, possibly because it a slower lens with a smaller front objective diameter. It varies with distance to background and the pattern of the background.
Hi there David!
Since it was mentioned in this thread I have now noticed similar bokeh from my 70-200mm f2.8 sigma as well - it must be something to do with sigma telephoto lenses as I haven't seen it on any other lenses.
Ralph, I've seen it from a range of telephotos, it's not just a Sigma problem. I've got my theories about why it happens but have never bothered testing them.
It's the image that's important, not the tools used to make it.
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Very nicely timed. Did you get any before and after shots? 
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