Sigman 150 - 500mm for Birding? opinions

Started Apr 28, 2012 | Discussions thread
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neocacher
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Sigman 150 - 500mm for Birding? opinions
Apr 28, 2012

I am using a Canon 7D and I am thinking of this lens as an alsternative to the 100 - 400L IS lens because of the longer reach and the lower cost. Opinions please?

Canon EOS 7D
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