Originally posted by P. Soo I'm relatively new to digital photography and have read the comments in this thread with puzzlement. I thought that after you stick a lens on your camera the auto, or manual, focus procedure will give you the sharpest picture. Are you folks saying that I have to calibrate each lens I use to the camera to get the sharpest picture?
Some lenses are pretty spot on with focus without adjustment. Some lenses need minor adjustment, and may not matter. Some lenses may need large adjustments. Some lenses are so fast (F1.8 and faster) that even small adjustments means you may miss-focus when shooting wide open.
The Pentax k-x has only a universal focus adjustment application. The Pentax k-5 (and the k-30) has a feature that allows it to adjust the focus for each lens.