I can obtain 120 second round stars with my mount /telescope without guiding. Maximdl says less than 10% on the flatness of the stars at .78 arcsec/pixel.
Could I use astrometric resynchonization with maximdl between images to obtain exoplanet data rather than guiding? It takes less than 2 seconds. Shorter than the image download.
My experience is that it is not ideal. But keeps me within about 5 arcseconds or 5 pixels. <4 arcsec FWHM stars. In my case it works well from about 58 degrees down to 0 degrees DEC. Further north it oscillates, Futher south are trees. I am hoping that I have some gain or agressiveness setting not optimal. Redoing polar alignment has very little effect.