Fields of view as they relate to the magnification of a telescope: a clarification

The manufacturers of telescopic instruments typically describe their products in terms of the magnification produced. Most include some reference to the "object field" or the "acceptance angle," i.e., the angle subtended by the entrance port at the center of the entrance pupil. This paper considers varied factors utilized for calculating magnification and object field and proposes expressing the object field in terms of prism diopters rather than degrees.