With the 16-50, what you're looking for is a focus field that is not flat.. A brick wall will work. But shoot off a tripod and make sure the camera is square to the wall. Expose at f2.8. If the lens has the misalignment problem that plagued some copies of the 16-50, one edge of the frame will be out of focus when the other edge is in focus. It's pretty easy to detect. From what I've heard, the lenses are really way off or not at all. My first copy was defective, and I noticed it before testing. With a brick wall test, it was completely obvious. Paul On Apr 9, 2010, at 7:11 PM, Larry Colen wrote:
> Would it be something like take a picture of a flat surface (brick wall) and > look for one corner being out of focus? > > > -- > 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. -- 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.
