Many thanks sassan and very comprehensive, but by buying the non IS model the difference in cost is not quite the 60-75%.
Mike, yes money the reason for the non IS model. As I stated in my first post I've never had the benefit of IS and find I can manage the Bigma without any problem, so the 400mm of the 70-200 + 2 x telextender should not be to much of a problem especially considering the £350 difference.
Again many thanks for your help in making a decision.
Harry
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