OPERAGLASSES

Opera glasses

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 5× is usually desired in these circumstances in order to minimize image shake and maintain a large enough field of view. A magnification of 3× is normally recommended. The design of many modern opera glasses of the ornamental variety is based on the popular lorgnettes of the 19th century.

The above text is a snippet from Wikipedia: Opera glasses
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opera glasses

Noun

  1. One or more pairs of small low-powered binoculars for use at a theatrical performance


The above text is a snippet from Wiktionary: opera glasses
and as such is available under the Creative Commons Attribution/Share-Alike License.

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