Hi Jim,
Yes, I was using my AVX. Once centered, I actually shut off the drive on it in case it decided to do any galactic wondering of it's own.
The AVX is set-up in a one spot place. And once started, I just let it sit and run so no human vibrations and blur the image.
Plus, these were relatively short exposures for me, only 10 seconds.
Normally, everything is very stable. But I've long thought that the minute corrections of the mount would cause 'star bloating' as the guiding and control deals with gear lash and time delays.
But with everything stopped mount wise, there is only the camera shutter, or natural vibrations, left to see. But the camera is all-telling and absolute during exposure. It records everything.
I'm just at a loss to explain yet what was occurring to make these odd images. But it was a waste of 'shutter clicks' on the camera's odometer...
I could surmise it could be ground vibrations, up to magnetism induced into the bar of steel I'm using for a Vixen Bar under the lens and camera.
It warrants further play, if I have hopes of trying to get some images of the Sun or the eclipse. (Which would definitely be much shorter exposures.)
Edit In: Stacking does seem to work with my DSLR, but there is a gremlin in the files from the G3.
As they use to say in early computing, Garbage in = Garbage out. Seems to hold true.
Say, maybe that's the G in the G3?