Hi Jo, I accept it's ok to allow the step size to be user set, but I don't think it's optimal. There are many users who will not get this set right (and there is a "right" setting to within a tolerance). It's true that you can experiment with a V curve to iterate/guess at step sizes, but I prefer a measurement that relates to CFZ and the motor/drawtube relation. That prevents jumping over the CFZ and not achieving best focus (i.e. step size too big), and wasting a lot of time (iterating through measurements where the step size is too small).

Hi Andrew, yes, multiple measurements makes for better averages, and I do this as well. It takes longer, and this is part of the reason I like having a solution to OP #3.

Cheers, Doug

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