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 [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
