When FoCal was first introduced back in 2011, it was possible to control the AF Microadjustment and AF Fine Tune on all supported cameras. We quickly added support for all the cameras that offered this calibration feature.
With the release of the Nikon D300s, Nikon removed the ability to control the AF Fine Tune from a computer. We believe this is partly due to a poor implementation of the AF Fine Tune control in the cameras as even though the D3, D3s, D3X and D700 supported control from a computer, it did not work reliably on any cameras so we subsequently removed it from all Nikon cameras).
Canon followed suit with the release of the EOS 5D Mark III, removing the ability to control the AF Microadjustment from the computer.
In order to work around this problem, we introduced User Assisted Mode. It works like this:
With the addition of voice prompts and the camera hotkey, you can stay by the camera and adjust as requested. The net result is a fast and efficient calibration with minimal user intervention.
To see more details about using UAM, click one of the links below: