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    Canon 400mm/f5.6 vs Sigma 150-500mm/f5.6-6.3

    Hello everybody, I've been wanting to upgrade my very old Tamron 80-210 for another better lens, with more focal length, better build quality and optics, I've been reading lots of reviews and had almost bought the Sigma 150-500 when a guy I know told me that he wanted to upgrade his Canon...
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