I'm a complete beginner with about a week of practice under my belt, so please bear that in mind.
The subject of autoguiding appears quite frequently and I think I now understood why it is useful. However, I am trying to figure out why it is not possible to use the same camera and lens used to take the "lights" instead of separate scope and camera. In my case I use a DSLR and a telephoto lens up to 300mm with an Ioptron SkyGuider that supports guiding on the RA axis only.
With appropriate software, couldn't the actual subs be used to provide a correction that would feed back into the mount?