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"parallelism" between CMMVe axis and Z axis

During CMMVe (HP-V-Ve) calibration, there are different options (focus, distorsion, center, rotation).

I'm wondering if the "parallelism" of the field of view to the zaxis (A0B0) is calibrated somewhere, and if yes, at what time ?

I tried 4 hits on the granit by autofocus with "measure at the center" unselected, created a plane and look at its vector (ok, I know that the granit is not perfect, but the vector is different than the same plane measured by contact - the field of camera is about 5mm*5mm)

I also compared a bunch of lines measured "all field of view" and at the center, and there are differences (about 0.1 mm between both methods from top to bottom of the screen).

Any idea ?