----- Original Message ----- From: "Joseph Tainter" Subject: Re: Frustrated With AF Problems
> Joe, I think you ran the test backwards. Depth of field is not the > issue, depth of focus is. As focal length extends, depth of field > decreases, but depth of focus increases. Try calibrating your 50-135 at > 50mm, and then see how it does at the long end. I am starting to think > that my long time eschewing of zoom lenses may not be such a bad thing > though. > > William Robb > > ----- > > Not following, Bill. At 135 mm the lens definitely was improved by a -4 > AF adjustment. So if testing at some other focal length gives a > different result, I will have soft images at 135 mm. That doesn't necessarily follow. William Robb -- 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.
