The Sigma 70-200/2.8 is supposedly well built but still displays the error. Too bad we cannot draw a lens-related conclusion. It appears the mechanism itself requires very low tolerances both on the camera and the lens and is very prone to error. :o(
Definitely. I don't think it has to do with the built quality of the lenses. Perhaps the cost would be too high if they had to make the end products close to absolute accuracy. These are the results that I have found with my Z-1p.
Right on: A35/2.8, A50/1.7, 70-210/4
Appears right on except not fully opened at wide open: FA77/1.8
Less than 1/2 stops larger than it should be: FA*24/2, FA43/1.9, F*300/4.5, FA*200/2.8
1/2 stops larger than it should be: FA100/2.8
regards, Alan Chan
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