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Peter
Not sure this will be of value in your discussion but at Astrofest I had a problem in getting the autofocus to work properly with the refractor in that I found with the latest software that the scope was going so far out of focus on either side of the CFZ that spurious hot pixels were being registered as stars and messing up the HFR calculations. This threw the focus off or made the focus routine repeat itself with adding extra points to the curve and making it worse.
So I shortened the step value and increased the number of steps to 9. The step value would be dependant upon your scope and I found that it never went out of focus so much that hot pixels were a problem with the HFR.
Just throwing that in there.
Allan
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