Amateur astronomers usually view small- and medium-aperture (50-70 mm) binoculars either as an inexpensive “entry level” instrument to the hobby or as a useful accessory to a more experienced observer’s “main” instrument, a telescope. There is a great deal of justification for this. Binoculars do indeed make excellent starter instruments for new observers, especially those of limited financial means. A medium-aperture binocular of reasonable quality is not only less expensive than the cheapest useful astronomical telescopes, but it is also much more intuitive to use, easier to set up, more portable, and has more obvious uses outside astronomy, for example, bird-watching or horse racing. It also enables the new observer to engage in useful observing programs, such as the Society for Popular Astronomy’s variable star program. These keywords were added by machine. Not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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