Pentax smc DA 18-270mm F3.5-6.3 ED SDM

Announced Sep 10, 2012 •
Lens | Pentax KAF
Pentax smc DA 18-270mm F3.5-6.3 ED SDM Ask a question in forums about the Pentax smc DA 18-270mm F3.5-6.3 ED SDM.
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Hi, I currently have a midrange zoom and a long zoom for my K-3. The long zoom performs just fine. The midrange zoom seems to have problems with autofocus, and I hear that this is a common problem when people mount non-Pentax lenses on Pentax cameras. Can anyone recommend some midrange zooms for the K-3 that do *not* have focusing problems and produce good quality images? Some I am considering are below. Only some of these have reviews on DXOMark. 1. Pentax smc DA 18-270mm F3.5-6.3 ED SDM 2....
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