Looks a lot sharper than some other samples ive seen!
now im in doubt about this and the canon 55-250
Well I guess if you're looking to get stationary birds I would go with the IS on the nifty 250. But for birds in motion and flight the Sigma will get you a little tighter and cheaper too. But actually I want to try the Canon 100-300 USM to get faster focusing during the high burst rate shots.
Matt

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