Why are there problems with Sigma and not Tamron?

Started Oct 28, 2011 | Discussion thread
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mike_2008
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Why are there problems with Sigma and not Tamron?
Oct 28, 2011

At least, so far I have not heard about any problems with tamron lenses on SLT, and I have been using the 1750 f2.8 with no problems at all.

How come tamron work Ok and sigma don't?
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IQ is not judged exclusively by high iso noise performance

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