Sorry, but how exactly does calibration work? I don't quite understand the app that goes with it, and of the four customisation options, only the focus setting is selectable for me. I have a Sigma 35 mm for Canon. Thank you!

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I must honestly admit that I also had a lot of trouble with this docking station and the corresponding software... No matter what I set, it didn't change the backfocus problem with the lens (SIGMA 18-35mm f/1.8 ART on Canon EOS 8'0D).... Finally I returned the docking station, as I also returned the lens to the dealer and then bought an original Canon lens.... so unfortunately I can't help, sorry.

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Question about Sigma USB Dock for Canon EF bayonet

Sorry, but how exactly does calibration work? I don't quite understand the app that goes with it, and of the four customisation options, only the focus setting is selectable for me. I have a Sigma 35 mm for Canon. Thank you!