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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 of
''Chambers's Encyclopaedia: A Dictionary of Universal Knowledge'', Volume 7
The Opticalia Museum Opera Glasses
''The Encyclopedia Americana'', Volume 11
Binoculars
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
Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most binoculars are sized to be held ...
at opera
Opera is a form of theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" (the literal translation of the Italian word "opera") is typically a collaboration between a composer and a libr ...
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
The field of view (FoV) is the extent of the observable world that is seen at any given moment. In the case of optical instruments or sensors it is a solid angle through which a detector is sensitive to electromagnetic radiation.
Human ...
. 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.
In addition to the more stereotypical binocular type, folding opera glasses were another common design. They were made mostly of metal and glass, with a leatherette cover for grip and color. Although folding glasses have existed in one form or another since the 1890s, they were perhaps most popular in the mid-20th Century and many from this era are marked "Made in Japan" or, less commonly, "Made in Occupied Japan". The design can still be purchased new, although the most common contemporary designs are now almost entirely plastic.
See also
*London Opera Glass Company
The London Opera Glass Company was officially formed in London, England on 20 May 1913 to produce opera glasses for theatres in London.
The company's purpose was to offer fashionable theatre goers in London's West End, technology that had star ...
* Monocular
* Spotting scope
*Opera
Opera is a form of theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" (the literal translation of the Italian word "opera") is typically a collaboration between a composer and a libr ...
* Opera hat
* Opera cloak
* Opera gloves
References
External links
''Chambers's Encyclopaedia: A Dictionary of Universal Knowledge'', Volume 7
The Opticalia Museum Opera Glasses
''The Encyclopedia Americana'', Volume 11
Binoculars
Glasses
Glasses, also known as eyeglasses or spectacles, are vision eyewear, with lenses (clear or tinted) mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms (known as temples ...
Theatre
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