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Gday MrB
I understood the mechanism used in the initial post, but the general topic was about having remote focusing ability at a laptop.
A single shot incremental unit limits you to lots of small moves if you want to say walk through focus. Also, loading effects due to pointing angle, ( i have a Meade SCT with Microfocusser ) supported load etc will give different results if its only a simple DC motor, and may not always move the same amount for a given impulse.
Having infinitely variable speed control means you can do what you want.
I use mine at high speed to walk back and forwards through focus, then drop down in speed to final tweak.
Note, The above is written based on the fact we have no absolute positional feedback, hence we are still using the Lappie screen view as our means of determining best focus position.
Andrew
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