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Rob - that's a good example of how the "wings" at the extremities are influencing the slope of the best fit lines and hence the intersection point - in particular on the LHS of the curve. If the result at 6216 steps was not included the LHS best fit line would have a steeper gradient and the intersection of the two lines would be further to the left. It probably doesn't matter for your setup with 20 steps across the CFZ. It would be interesting to see a shot with a Bahtinov mask on your rig if you autofocused and then moved the focuser 15 steps and took another shot.
I can see a difference in the bahtinov mask with a 5 step movement on mine.
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