You really need a fine line scale to determine focus. Do you have a meter stick? Focus on a number midway down the stick, with it lying on the floor. Come at it from a 45 degree angle. If you're getting inconsistent results, I suspect your test method is askew.
Paul On Mar 20, 2011, at 2:28 PM, Tim Øsleby wrote: > Shit. Redid the test. On tripod, focused at a remote control (don't > have a proper test chart). > This time it back focused a bit at 16mm, back focus a lot at 28mm, and > spot on at 50mm. Same result in tungsten light. > > Am I doing something wrong, or is the lens a wreck? Or is it the camera? > > -- > MaritimTim > > http://maritimtim.blogspot.com/ > > > > 2011/3/20 Tim Øsleby <maritim...@gmail.com>: >> Just did a formal test using the AF-assist light. >> It did OK at the long end, but front focuses heavily at 16mm. >> Hm. >> I'll redo the test, and include the mid range. But it does not look >> good so far. >> >> Will test it in the studio later. Right now it is occupied by a college. >> >> -- >> MaritimTim >> >> http://maritimtim.blogspot.com/ >> >> >> > > -- > 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.
