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?
There are some variances between lenses and camera bodies which mean that some lenses need an AF adjustment (a very very minor one) to be dead on accurate (especially noticeable on fast lenses with thin DOF like f1.4)
With the K-5 it can remember the AF adjust settings for a variety of lenses so you only need to set it once per lens. Other bodies can only do one lens at a time or not at all.
For manual focus this has no bearing, except maybe if you use the focus lights or catch-in-focus