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Hi Troy. I have recently build electronic focuser for my 150mm SW refractor using GSO Crayford focuser, Autostar hand controller and ETX 105 focuser motor.
I have spent about four hours trying to get FocusMax to finish V curve, getting same errors you describe. Eventually I got it working. This is how it worked for me.
Manually focus best you can. Selecting right star is probably most difficult. I tried Mag 2 to Mag 6. It did finally worked with Mag 3.4 . I suspect that usable star Magnitude depends on sensitivity of your camera. Centre the star and switch on Autoguiding. Double click on relative position number box – that will reset position to zero. Start the Wizard. When it finally worked it took 61 seconds from start to finish focusing.
I took few images before it clouded over and compared it to previous manually focused images. The focus was better then my best manual focus and if it is going to focus consistently and takes about minute to focus I will be very happy. I could not try is since my first go – it is cloudy all the time
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