Hi I've owned several variations of the Sigma 70-300, DL, APO Macro, APO Macro Super etc. all were soft at the edge of the frame at 300mm and CA is evident, unlike some of the better APO (EX)lenses where CA's are negligible. IIRC the F70-210 performed better at 200mm than any Sigma I tried in the 70-300 range. IOM the Tamron is a far better lens optically, I'm sorry I waited so long before trying one myself, it remains to be seen if the DA 55-300 is better than the Tamron optically.
Regards, John On Tue, 06 May 2008 17:31:24 +0200, Andreas Pfotenhauer wrote > 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 > > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above > and follow the directions. ---------------------------------------------------------------------------------------------------- The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message. ---------------------------------------------------------------------------------------------------- -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
