Thanks for all the replies.
After testing by calibrating about 10 times. A few times on purpose compleet wrong. I discovered: When calibrated it wrong, I could not focus on an object manually , that was somewhere between 50 and 100 meters away, because the manual infinite point was reached around 10 meter.
Strange enough this was worst with the lens set on 28 mm. Testing the auto focus bij taping on the same object around 50 and 100 meters away it looked like a good focus (green square and peeking on), but this was far from sharp. The auto focus was focusing better and better while going to focus on objects closer and closer by. In my opinion bad calibrated lens, can lead to bad auto focus as well.
Than did calibrating as good as I could. with lens on different "zoom" points from 14, 20, 28, 35, to 42mm.
Again strange... good calibrated with lens on 42mm, at an object around 82 meters away, gave me best results over all. This way I could get the objects sharp in all zoom points at all distances. At 28mm the manual infinite was exactly right (in my opinion still not perfect, because all my other cameras/lenses have some more "focus room" infinit is always sharp just a little behind, even the moon.) Now also auto focus is sharp in almost all pictures, from 14mm to 42mm. Best overall sharpness with f8.
Hope this calibration will stay this way after using an other lens.
Thanks