I have been doing some plate solving and centering with a cge-pro and realized there is a limitation to the accuracy that can be improved using a feature of the mount.
I found that repeated attempts to solve and center the image yielded no improvement on the arc-minute scale of error - and in fact there is no expected improvement since all it is doing is solving/syncing/slew. As long as the solve and sync are accurate, the main error is in how accurately the mount lands where it wants to when it does a slew - and that won’t be perfect in the first place because it requires timing and dead-reckoning to have the mount land at the right encoder values at the right time.
But I did find improved accuracy by using the “calibrate goto” feature of the mount - which attempts to measure the error in the goto timing and correct for it. I am imaging at 0.57" per pixel and I had set a centering accuracy of 100 pixels - and it wasn’t able to reach that. But after doing calibrate goto, it is now around 60-80 pixels - or about 1/2 arc-minute. I need accuracy because I am using OAG with a fairly small sensor (qhy5l-ii) and I want the guidestar to appear after I do the centering.
So - this is a little-used feature of celestron mounts - but it has an application here to improve accuracy in a slew. Ideally I would like an option not to do a slew to recenter - and instead to do a calculated nudge. I assume that is already a feature request. Done properly that should actually converge on the requested target location.