On Dec 4, 2013, at 9:17 AM, "CollinB" <[email protected]> wrote:
>> The DA* 16-50 can be superb, but many of them have element alignment > problems. You have to test and insist on a good copy or correct repair. >> Paul > > What does one look for in the image? Coma? Corner softness? > > Uneven focus across the frame. Test against a grid with the lens wide open and the camera square to the target. if the elements are misaligned, one side of the frame will be noticeably softer than the other side. Pau > -- > 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. -- 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.
