Yes, you should. If you zoom in 10x on LV, you'll see it actually is still pretty clear. Remember, the AF point is actually fairly small, and that FoCal (in normal, default mode) is only checking the center AF point (I think) and using that to determine the AFMA. Also you'll have to change the AFMA settings yourself in between each test. Not FoCal's fault, Canon decided to remove the settings in the SDK for the 5d3 and 1DX. Bug Canon to get them to fix that. I have, hasn't done any good. I keep getting back generic, politely worded "thank you for your input, go suck an egg" responses.