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Are some lenses too generous with microfocus adjustments for this method to work?  I just successfully ran my 85 1.8 (on a 6D) through the run and it came out with +4.  But I tried the 35 2.0 (non-IS version) and the focus confirm pings successfully across the entire -100 to +100 range.  I was using a target of some 12pt font on standard 11x8.5 both 3 feet away and 6 feet away.