I need to calibrate my XF/3100 focus trim and there are many method in the internet.
Have anyone try the moire method describe here:
AF microadjustment for the 1Ds mark III, 1D Mk3, 5D Mk2, 7D, 1D X
autofocus - What is the best way to micro-adjust a camera body to a particular lens? - Photography Stack Exchange
I have tried a long time ago with dslr and I am not sure about with the XF.
Also in the web, many free pattern is available. Some method the pattern lay down in floor while the camera 45 degree down ( I have tried this and it was hard to make sure the pattern is square to the camera. left and right part of the pattern has slightly different focus point. Other has the pattern in 45 degree flat surface while the camera is straight on (lens align method).
Can someone please give some advise regarding best DIY focus trim?