Jared, could you explain how the backlash is used? It seems to me that if the algorithm always approached the focus from the same direction that backlash compensation might not be needed. As I recall, the current code offsets the focuser by an amount equal to half the number of steps times the step size and then proceeds to move in one direction to generate the V curve. After determining the focus point, if the algorithm were to go the starting offset and then moved to the focus point wouldn't that negate any backlash?
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