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well it sounds like you got a dud. In all the millions of lenses sold there are bound to be a few, you're just as likely to buy a dud different make as another from Canon, i.e. not very likely but there are a few about. But if it's put you off, I'm sure there are plenty of other possibilities.
I've had good Sigma lenses in the past 10-20, 18-50, 50-500 but currently shoot mostly Canon L.
(I've never had dud lens BTW, Canon, Sigma or Tamron)
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