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Opera Glass
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. 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. 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opera Glasses (France), Ca
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 librettist and incorporates a number of the performing arts, such as acting, scenery, costume, and sometimes dance or ballet. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor. Although musical theatre is closely related to opera, the two are considered to be distinct from one another. Opera is a key part of the Western classical music tradition. Originally understood as an entirely sung piece, in contrast to a play with songs, opera has come to include numerous genres, including some that include spoken dialogue such as ''Singspiel'' and ''Opéra comique''. In traditional number opera, singers employ two styles of singing: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military models. Unlike a (monocular) telescope, binoculars give users a three-dimensional image: each eyepiece presents a slightly different image to each of the viewer's eyes and the parallax allows the visual cortex to generate an impression of depth. Optical designs Galilean Almost from the invention of the telescope in the 17th century the advantages of mounting two of them side by side for binocular vision seems to have been explored. Most early binoculars used Galilean optics; that is, they used a convex objective and a concave eyepiece lens. The Galilean design has the advantage of presenting an erect image but has a narrow field of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 librettist and incorporates a number of the performing arts, such as acting, scenery, costume, and sometimes dance or ballet. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor. Although musical theatre is closely related to opera, the two are considered to be distinct from one another. Opera is a key part of the Western classical music tradition. Originally understood as an entirely sung piece, in contrast to a play with songs, opera has come to include numerous genres, including some that include spoken dialogue such as '' Singspiel'' and '' Opéra comique''. In traditional number opera, singers employ two styles of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. Humans and animals In the context of human and primate vision, the term "field of view" is typically only used in the sense of a restriction to what is visible by external apparatus, like when wearing spectacles or virtual reality goggles. Note that eye movements are allowed in the definition but do not change the field of view when understood this way. If the analogy of the eye's retina working as a sensor is drawn upon, the corresponding concept in human (and much of animal vision) is the visual field. It is defined as "the number of degrees of visual angle during stable fixation of the eyes".Strasburger, Hans; Pöppel, Ernst (2002). Visual Field. In G. Adelman & B.H. Smith (Eds): ''Encyclopedia of Neuroscience''; 3rd edition, on CD-ROM. El ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lorgnette
A lorgnette () is a pair of spectacles with a handle, used to hold them in place, rather than fitting over the ears or nose. The word ''lorgnette'' is derived from the French ''lorgner'', to take a sidelong look at, and Middle French, from ''lorgne'', squinting. Their precise origin is debated: some sources describe English scientist George Adams the elder as their inventor, while others cite his son George Adams the younger. The lorgnette was usually used as a piece of jewelry, rather than to enhance vision. Fashionable ladies usually preferred them to spectacles. These were very popular at masquerade parties and used often at the opera. They were worn popularly in the 19th century. The lorgnette was employed as a prop and affectation by early 20th century trial lawyer Earl Rogers, and one is featured on the front cover dust jacket of his biography, ''Final Verdict'', by his daughter Adela Rogers St. Johns. Etymology This word comes from French ''lorgnette'', from ''lorgne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 started in Vienna and Paris in the 19th century. Opera glasses were not new at the time of the company's formation. In fact, they were a fashion accessory at the end of the 19th century and the beginning of the 20th century. It was not until 1912 that the London Opera Glass Company installed discreet dispensers on the backs of seats, enabling patrons to rent them for 6d (2p in today's money). Since the formation of the company, around 11 million patrons have used its opera glasses to view theatre productions such as Noël Coward's comic play ''Hay Fever'' in 1925 and ''The Phantom of the Opera'' musical by Andrew Lloyd Webber. In 2009, two major London theatres, the Comedy Theatre and the Savoy Theatre, installed £1 opera glasses from the compan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monocular
A monocular is a compact refracting telescope used to magnify images of distant objects, typically using an optical prism to ensure an erect image, instead of using relay lenses like most telescopic sights. The volume and weight of a monocular are typically less than half of a pair of binoculars with similar optical properties, making it more portable and also less expensive. This is because binoculars are essentially a pair of monoculars packed together — one for each eye. As a result, monoculars only produce two-dimensional images, while binoculars can use two parallaxed images (each for one eye) to produce binocular vision, which allows stereopsis and depth perception. Monoculars are ideally suited to those application where three-dimensional perception is not needed, or where compactness and low weight are important (e.g. hiking). Monoculars are also sometimes preferred where difficulties occur using both eyes through binoculars due to significant eyesight variation ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spotting Scope
A spotting scope is a compact high-power telescope optimized for detailed observation of distant objects. They are used as portable optical enhancement devices for various outdoor activities such as birdwatching, skygazing and other naturalist activities, for hunting and target shooting to verify a marksman's shot placements, for tactical ranging and surveillance, and for any other application that requires higher magnification than ordinary binoculars (typically 20× to 60×). The light-gathering power and resolution of a spotting scope is determined by the diameter of the objective lens, typically between . The larger the objective, the more massive and expensive the telescope. The optical assembly has a small refracting objective lens, an internal image-erecting system, and an eyepiece that is usually removable. The image-erecting system may use relay lenses, prisms such as Porro or roof prisms, or a catadioptric system of the Schmidt or Maksutov design. Spotting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 librettist and incorporates a number of the performing arts, such as acting, scenery, costume, and sometimes dance or ballet. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor. Although musical theatre is closely related to opera, the two are considered to be distinct from one another. Opera is a key part of the Western classical music tradition. Originally understood as an entirely sung piece, in contrast to a play with songs, opera has come to include numerous genres, including some that include spoken dialogue such as '' Singspiel'' and '' Opéra comique''. In traditional number opera, singers employ two styles of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opera Hat
An opera hat also called a chapeau claque or gibus is a top hat variant that is collapsible through a spring system, originally intended for less spacious venues, such as the theatre and opera house. Typically made of black satin, it folds vertically through a push or a snap on the top of the hat for convenient storage in a wardrobe or under the seat. It opens with an easy push from underneath. Name Its French name "chapeau claque" is a composition of ''chapeau'', which means hat, and ''claque'', which means "tap" or "click". The "chapeau claque" is thus a hat that folds with a click, and unfolds likewise. In English, the hat model is usually referred to as a ''collapsible top-hat'', ''gibus'' or more often ''opera hat''. History The construction may originally have been inspired by a historical hat model called "chapeau bras" ("arm hat"), made as bicorne or tricorne to be carried folded under the armQuinion, Michael. ''Why is Q always followed by U?'' Penguin Books. 2009 On ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opera Cloak
An opera cloak is an ankle- or floor-length loose-fitting cloak of dark, luxurious fabric such as velvet, brocade or satin, to be worn over an evening gown for a woman or a man's white tie or black tie tuxedo, named after its typical designation for the opera. It may be described as a fitted cloak (sometimes with sleeves), generally not as tailored as a coat. For white tie, men's opera cloaks are frequently worn with a walking stick and top hat. Like cloaks and capes, the opera coat is usually lined in a coloured expensive fabric, such as silk, or a weave like satin, for a more opulent look. An opera coat often has an elegant or dramatic collar, and may have padded sleeves. It may or may not be trimmed in fur. It often has an elaborate braided rope instead of buttons at the neck. See also *opera *opera hat *opera gloves *opera glasses Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
