AFMA Oddity

[alexturton]

I have a question about afma.

I have 2 bodies (60d and 5d3). They are both calibrated to be the same and All my lenses need no afma adjustments


However I just bought a tamron 150 600. On my 5d3 it appears to near +6 on the tele end and -5 on the wide end. However my 60d seems to be fine with it.

Is this possible? Or must my tests be wrong.

 

[Mt Spokane Photography]

The oddity is that any lenses are the same on the two cameras.
However, I've understand that a camera compensates for the actual lens attached to the camera by using a data table in the firmware. Since a third party lens must lie to a camera, and tell it that its a Canon lens, this can cause simple things like AFMA issues, or even bigger ones.