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That makes a lot more sense. I was playing with the back focus between the field flattener and imaging camera - I went out as far as 120mm then back in to 55mm (much better). The camera went in to about 500 - scope about 4mm extended from the OTA out to around 17,400. So it certainly has excellent range.
I have had APT fail on one or two times during a change from Luminance to red filter - that triggered a small offset change - and the motor makes a whirring sound but nothing moved. I presume as the didn't reach its prescribed offset the imaging plan just halted with camera saying it's busy - but not saying hey I have been blocked for 20 minutes waiting for the focuser move to finish! I went out to the astro lab to check it when I noticed this - a turning he motor off and on in APT sorted it. I then did a series of filter changes and the focuser got th eoffset right each time.
So no idea what went wrong there - it had a bit of weight to lift as the OTA was pointing almost straight up. But when I disconnect and restarted the imaging run it then ran fine for hours.
Reckon APT should have a check and a loud / visible warning for a focuser failing to change position which then blocks a run - and or an option to select an automated disconnect focuser, wait 5 seconds and reconnect and see if the issue clears!
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