What is a Dobsonian mount???
The Dobsonian mount was first introduced by John Dobson and has gained wide popularity among amateurs because it is highly portable, easy to build and relatively inexpensive.
The key points in the mount are the two bearings, the altitude (vertical) and the altazimuth (horizontal) bearings both of which consist of a Teflon pad with a metal, vinyl or Formica surface resting and rotating on it. The only major disadvantage is that it is not equatorial so you can’t track objects or use setting circles for aiming (you can get digital interfaces which will calculate the location of objects on a alt-az mount for a few hundred dollars) or some people build a motorized equatorial platform that will track by tilting the base of the mount.
