Has anyone compared these three lenses?
Canon 100-400mm IS L series
http://www.the-digital-picture.com/Reviews/Canon-EF-100-400mm-f-4.5-5.6-L-IS-USM-Lens-Review.aspx
Sigma 120-400mm DG OS
http://www.sigma-imaging-uk.com/lenses/telezoom/120-400mm.htm
then this this one :cuckoo...
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