"It appears that at 16mm the lens is not focused all the way to infinity but the resulting pictures of remote objects are still as sharp as they can get (well within DOF) even at f2.8."
Antti, what you are describing is a lens with a defect--apparently a fairly common defect. Your images still appear approximately okay because at 16 mm the depth of field is so great. On my K20D, the DA* 16-50 at 16 mm would not autofocus beyond the 2 m mark. That is, it would not autofocus to infinity. If I focus manually to infinity the images are much sharper. So the lens is front-focusing badly at this focal length. From 18 to 50 mm the lens focuses to infinity just fine. My K20D and both of my DA* zoom lenses have been sent to Pentax to be repaired. Joe -- 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.
