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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 London Opera Glass Company was founded in 1913 and provides opera glasses in many of London's West End theatres.
Video Opera glasses
See also
- Binoculars
- List of telescope types
- Monocular
- Spotting scope
- Telescope
Maps Opera glasses
References
src: cdn.levenhuk.com
External links
- Chambers's Encyclopaedia: A Dictionary of Universal Knowledge, Volume 7
- The Opticalia Museum Opera Glasses
- The Encyclopedia Americana, Volume 11
- The History of Opera Glasses
Source of the article : Wikipedia
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