Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances. A magnification power below 5× is usually desired for such use (vis-à-vis, for example, birding) both to minimize image shake and to maintain a large enough field of view.
Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances. A magnification power below 5× is usually desired for such use (vis-à-vis, for example, birding) both to minimize image shake and to maintain a large enough field of view.
Source: Wikipedia "Opera glasses" · CC BY-SA 4.0
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