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 at opera performances. Magnification power below 5x is usually desired in these circumstances in order to minimize image shake and maintain a large enough field of view.Fact: date=June 2008 A magnification of 3x is normally recommended.Fact: date=June 2008 The design of many modern opera glasses of the ornamental variety is based on the popular lorgnettes of the nineteenth century.

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