Yes, multistar - Default (1).
And definitely, if your stars are not round, it will profoundly affect the guiding. It is like guiding on a star cluster or a galactic core then. There would be no consistent radius.
How does your guiding change when you are using your main telescope as the guide scope?

Oh .. bummer

This remains to be seen. I have never tried. Scope Nights reports rain and an overcast sky for the next week.

I have a 10 year old Celestron CGEM DX, which I purchased new. Other AP'ers consider the CGEM a lower quality mount, but it does carry its weight. However, the older CGEM's, like mine, may have had a better quality build than the newer ones made by Synta (I don't really know because the design has not really changed). I have mixed results with this mount; some nights it works like a charm and others I cannot get it to calibrate (I have an OAG with a Lodestar guide camera and have always used Phd1 or 2). I too think it depends on seeing and where in the sky I am looking. I do rebalance the mount to keep it East side heavy where ever the scope is pointed. But I don't know what to do about Dec (I purchases some ankle weights that I thought I might try using to keep it South heavy as well). On a good night my Cal looks like this:


and my guiding can look like this for several hours:



I will not spend the money for a much better mount (2-5x times), so I am thinking of purchasing a "hypertune" kit that will replace the bearings and worm gears with better quality ones. Also, my mount is very stiff; it does not rotate freely and I suspect it has the old 'black' grease in it that makes it sluggish, the kit comes with newer grease. Running it with Kstars/Ekos (as I have done for the past several years)is fine and goto's have greatly improved with plate solving. I can "slew" dead on to a target with usually only 2 solves. So I don't think there is anything wrong with the mount and that is why I am thinking I should not try fix it! But I do think it could work better.

Ron

@Ron,

these "mixed results" you describe are from my perspective the driving force behind tuning or upgrading the mount considering the precious time we spend under clear skies.