Hi Matteo, ok, I understand now why you suggested max steps to reduce the measurement error. We agree that more is better in this regard. I think a tool-tip on the entry field could be useful for explaining that. The fields might be better named "focuser motor steps" and "focus travel (mm)" or similar. Then the alg should calculate microns/step, compare to calculated CFZ (based on the other params), and set the proper step size. CS Doug

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