If you mean it's focussing beyond the subject you need a negative value. You need to choose a focal length and distance to subject to do the calibration at as it will be slightly out at other settings.
I also recommend something like the focal AF software which I have, or lens align which I don't, to make the testing less subjective.
I'm now happy with mine and leave it on the camera most of the time.
I also recommend something like the focal AF software which I have, or lens align which I don't, to make the testing less subjective.
I'm now happy with mine and leave it on the camera most of the time.