Just an update on the ASI AIR Pro and the  Mach 1( CP4) ..The Raspberry Pi software/plate solve in the AAP does a wonderful job of polar alignment .. After two iterations of PA ,I checked it against SharpCap and RAPAS and it was dead- on with both. More importantly I was doing three minutes subs without guiding and saw nice round stars.  The AAP (PhD 2 light) auto guider is just ...um...ok... a bit of patience/ frustration to get the aggressiveness correct and the other setting needed more than bit of tweaking.

So to answer the question I asked above about resetting  to Park...The 'trick" is after you PA, do a long GOTO to the West side of the mount, plate solve, hit sync in AAP and got to park on the AAP. You'll be a bit or a lot off.. open the clutches and manually  move the mount to the Park position of you choice  and tighten the clutches. Do a long GOTO East, plate solve,  and back to Park and open and close the clutches again to get the mark lined up perfectly. I have hit every GOTO right in the middle of the camera's field of view since then.  And even after shutting off the CP4 and AAP, the postitioning/ GOTO was perfect two nights later.

I posted my first light pic at Lee D. Photos