So far I've adjusted the FA 50/1.4, the FA 35/2 and now the DA 16-45/4. The 50/1.4 came in at -4. I retested to make sure. Same result: -4. The FA 35/2 came in at +2. Tonight I did the DA 16-45/4, and as I suspected, it was closer to dead on at just +1 adjustment.
I simply do a series of shots of crisp typography off the tripod, wide open (or just slightly stopped down) at seven or more adjustment values. I use single point, center autofocus. I convert each shot to a full-res 16-bit file, line them up on the monitor, then pick the sharpest one, based on the letter where the center point autofocus fell. It's easy to see the sharpest at 200% of full resolution. I can check a lens in about fifteen minutes. I like this feature. But the lens-to-lens variation I'm seeing also explains why Pentax went to this lens-specific adjustment. I'll bet that in trying to address the complaints of K10D owners they realized that adjusting focal point for one lens didn't necessarily make the camera correct for every lens. I think we have a very good thing here. Paul -- 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.
