I gave up on Tapes when he made the (now disappeared) video demonstrating his Long Ruler product in which he appeared blissfully ignorant of the fact that some lenses have field curvature and that is is therefore not of any practical use to measure focus at one place having targeted focus at another on the same plane... I am using a beta of Reikan Focal for Mac, and though it is buggy, it shows great promise and at least for the single focus point calibration, which is what the tapes product will offer, it gave me the same result with all my glass as hours of messing about by hand...
