I shot another series of lens tests today. This is one of the images. The target's 0 dimension is centered in the lens, so only the lower left quadrant (quadrant 3 for you mathemeticians) is used for the analysis. This test is very conditions sensitive. I continue to work out the procedure. I think that the only way to really calibrate this method is a round-robin like test with several people using the exact same lens for their tests.