I chose between Canon EF 24-70f (2.8L USM) and this model. Having lost in aperture ratio, I received a larger range of focal lengths and decent cost savings. The lens stands on the Canon EOS550D crop as a staff member, suitable for all types of shooting, for all occasions: "And to the feast, and to the world, and to good people." You can fight all his "childhood illnesses": by holding down the aperture, raising the ISO, and yes, the professionals will forgive me: Flash has not been canceled yet :-) Very satisfied with this model.
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