Imagine aiming something only to watch it slowly and constantly move off target. Yet that is the position that Dobsonian telescope users find themselves in.
Dobsonian telescopes offer big thin mirrors with stable, inexpensive altazimuth mounts.
Motorizing a dobsonian adds automatic tracking and finding capabilities. With the object remaining centered in the eyepiece, you enjoy the relaxing view. In addition, you can use higher magnifications to bring out detail. Finally, you can greatly extend your reach into the universe by attaching a CCD or electronic camera to your large mirror dobsonian telescope. The rapid locating of very faint objects is easier thanks to computerized slewing.