Thanks for the replies. Will try all of the suggestions. I was very close with the focus test, but was able to focus manually. Manual focus was spot on. No front or back focus issue. Pun intended. You are correct, I do need to use manual focus on macro, especially with focus stacking. My eyes don't work so well with manual focus, but they should be adequate. I will test the front and back focus again at a little greater distance with the 55mm before I attempt to adjust the camera settings for the lens. I am hoping that the single test allows me to select the lens by focal length, as I would hate to adjust for all lenses as the others all work. Just bought the 70-200 Pentax and tested it as well. Works very nicely. I think this is going to be a beautiful lens as it is fast (2.8), focuses relatively quickly(hopefully as fast as I need), and appears to be very sharp.
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