Originally posted by sebberry This is what confuses me and makes it so difficult to calibrate my lenses. You should absolutely see a difference between those values, otherwise the adjustment isn't doing what it is supposed to. This is what's making it so difficult to figure out focus on this thing
My experience with the birds earlier today made me feel like I was back on my K5.
I think part of it was how I went about testing the lens. Shooting at building a good 200 ft away means that each value on the AFFA will visually mean a very minor adjustment. While this may not be an ideal way of calibrating the lens, I went about it this way, because for me, this is likely the most common way I would use this lens (birds in flight, wildlife, etc). Shooting a focus chart can be a lot easier...especially when your focal length isnt effectively 630mm.
Ive used focus charts in the past to check lenses. I did it when I first bought the original DA* 16-50 lens. Tested it with focus charts, flat brick walls, etc. I felt like the lens was decentered, but wasnt 100% certain. Had my camera at a family gathering, and took some small group shots of family members. As soon as I pulled them up on my computer to edit them, I was able to see with absolute certainty that the lens was decentered - Everyone on the right 1/3 of the frame was so soft that they almost appeared out of focus, while the center 1/3 and even the right 1/3 was in focus and sharp. Sent the lens to Pentax for servicing and it was replaced.