I don't know why I never thought of doing it this way... My FA-50 1.7 has always given me "surprisingly soft" results and I've always suspected that the focus needed to be calibrated but never had the time. In the kind of low-light situations where I use it, manual focus is as dodgy as auto.
Yesterday I found a website which described a dead-simple way to do it if you have LiveView (and the K7 has exactly that). No focus targets or brick walls needed. Here's how it works: 1. Set up a target a few feet away. I used a wine bottle. 2. Set up camera on tripod with center focus point selected. 3. In Live View, press AF and wait for focus to be locked. 4. Turn off Live View 5. Press the AF button again and watch which way the focus ring moves. Ideally it shouldn't move at all! 6. If it does move... go into the focus calibration settings in the custom menu and add/remove points. 7. Repeat steps 3-6 until the damned ring holds still. Done. My FA-50 needed seven correction steps to the left (can't remember if that's "plus" or "minus") - SERIOUSLY out of whack. My DA-35 only needed 2 steps in the other direction. My Tamron 28-200 was dead on as is my 16-50. I can't wait to use the FA-50 in another low-light situation to see if it nails the focus in a real-world situation now. It never has before. :-( It was so simple and easy to do I almost wished I had more AF lenses to try it on! If anyone would like to pop my bubble, please go ahead and tell me why this isn't the right way to go about it... -Charles -- Charles Robinson - [email protected] Minneapolis, MN http://charles.robinsontwins.org http://www.facebook.com/charles.robinson -- 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.
