Doug S replied to the topic 'Question about focuser module' in the forum. 1 month ago

From the specs you posted, you've got it right.....16K steps/revolution. Nice motor resolution! Ok, now you want to measure your telescope focuser drawtube motion (unless you already know it). If you don't know this, just rack the focuser some measurable distance while paying attention to the number of revolutions. Divide the travel distance by the number of revolutions, and convert to microns. Finally 16K cnts/rev divided by N microns/rev focus travel = Y motor cnts per micron travel. Now compare to your CFZ size, and you'll know how well your motorized focuser will sample your CFZ. I suspect you're going to have plenty (maybe too many) counts through your CFZ. Being oversampled isn't really a problem other than it works the motor a bit more. Better oversampled than undersampled!

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