Dot-Tune: Autofocus Fine Tuning in under 5 minutes

It is hard to diagnose any potential error if a final decision has already been made. The process does work. I've successfully done it to my 1DXs, 5D3 and a friend's 7D2. While its simple, that's only if it's strictly followed. Miss or veer from a step and the results are subpar. Distance to target, Live view fine tune, putting lens into MF, recognizing a missed AF confirmation etc... all important. One very common miss, is in doing the math at the end.

EX) a determined range -5 to +13. Total range is 18, half is 9, so the MA to be put into the body is 4 (-5+9=4 or 13-9=4)