Magnification power below 5× is usually desired in these circumstances in order to minimize image shake and maintain a large enough field of view. By the second half of the 19th century they had become essential fashion accessories for theatre- goers.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.
Each glass was worked on by painters, goldsmiths and other artists. The making of fine opera glasses entailed knowledge not only in optics. Two years later in Paris, Pierre Lemiere improved on these, and created the center focus wheel, which allowed the focusing of both eyes together. Each eye-tube extended independently for focusing. It was built of two cylinders connected with a bridge. It was not until 1823 in Vienna, that the first binocular opera glasses were invented and put into use. Many opera glasses were given as gifts and tributes, as can be learned from the inscriptions found on many of them. By the second half of the 19th century they had become essential fashion accessories for theatre- goers.
The body was decorated with gems, enamel, ivory and other decorations. These were monoculars small Galilean telescopes. We find Opera glasses mentioned in a London advertisement as early as 1730.
Excellent Condition.ĭimensions: 9 x 5.5 cm closed - 7 cm open Adjustable Opera Glasses with original case.
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