I just bought a used Sigma lens (50mm Art f / 1.4) for my Canon 7D2 (Mark II) case. This combination creates a very serious problem of gravity:
- Without correction of micro-adjustments on my body, the aircraft in focus is about half an inch farther from the one I target with the viewfinder: for a portrait of someone located a few meters away, when you focus on the eye, the focused area is somewhere between the eye and the ear.
- With the maximum correction of micro-adjustments in my body (-20 of -20 / + 20 range), the problem of the rear focus is attenuated, but still there. I imagine that -25 or -30 could have solved this problem, but it is not available.
- when you use Liveview to focus, everything is fine.
I used f / 1.4 while trying to calibrate micro-adjustments.
Do you think using the Sigma USB Access Station to adjust the focus setting of the lens would solve this problem? Do I have to resell it and buy another copy?