Sounds like you did your homework. Return the lens to the seller. I had a centering proble on my first DA* 16-50, and B&H replaced it without question. If it's too late for that, get on Pentax. Show them your test results. Paul -------------- Original message ---------------------- From: "Mark Erickson" <[EMAIL PROTECTED]> > Paul, > > I tested the lens using my K10D on a tripod. Test shots were done at F/8. > During both sessions (before I sent it back and after), I did a comparison > test with a prime lens. The first time, it was my FA 50 F/1.7. The second > time it was my FA 43 F1.9 ltd. In both cases, the prime lens tests came out > with essentially even sharpness across the frame. So I don't think it's my > K10D. > > The lens and its mechanism seem solid, but I think that there is something > about it (either design or manufacturing defect) that is just not > mechanically stable. > > --Mark > > Paul Stenquist wrote: > >If the problem was a centering defect, it should be consistent. How > >does it perform wide open? I'm surprised you're seeing any softness > >at f8. How about the camera your testing it on? Are you sure you > >don't have a mirror box problem? Have you tested other lenses on the > >same camera? > > > >I'm don't want to be a contrarian, but the inconsistency of the > >problem suggests it's not a centering defect. Of course I could be > >wrong, and I frequently am. > >Paul > > -- > 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.
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