| http://www.w3.org/ns/prov#value | - Some say focus is a little slow.Then there is the Sigma 50 - 500mm a lot smaller but with greater reach in a single package, nothing like as fast as the 120 - 300mm, it is a whole heap cheaper, and there are loads of them on the second hand market, image quality is pretty good.The Canon 100 - 400mm IS L is optically very good, it is an old design & the IS will only give you 2 stops, the 70 - 200mm F/
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