heard that rumor several times but never actually saw one that had that softness at the long end. so it seems i gut lucky. The Tamron AFAIK is a fine lense if you dont mind some CA's > The Sigma is so weak at the long end that (in the sample I had) images > appeared out of focus. > > People usually recommend Tamron's version of the same telezoom. But both > will be outperformed by Pentax's forthcoming DA 55-300 and DA* 60-250 F4. > > The SMC F 70-210 is quite good, but I haven't tried it on the K20D's sensor. > > Joe > >
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