Other things, like setting mirror lockup and de-focusing between each shot, analysis of each image for sharpness/detail and graphs to determine the best AF calibration value work automatically. What this means is that FoCal still provides its full automated calibration, determining which and how many AF Fine Tune points are needed for the calibration result. The features that can be controlled are dictated by the camera manufacturer, they expose the ability to adjust certain settings through a documented interface which FoCal uses to make all the necessary automated adjustments to the camera. Software control of the AF Micro Adjustment (or AF Fine Tune) setting on certain cameras (designated as 'User Assisted') is not possible from a computer. A series of proprietary image processing and predictive statistical algorithms mean that FoCal is able to calculate the best AF calibration for a particular lens accurately and easily, with minimal input from the user. Using this connection it is able to operate the camera remotely, driving it to capture test images, download those images and analyse them for sharpness to determine the best AF calibration value for each lens. FoCal runs on your computer and connects to the camera using a USB cable (supplied in the box with new cameras).