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  2. Opera glasses - Wikipedia

    en.wikipedia.org/wiki/Opera_glasses

    Mother of pearl opera glasses and leather case. Opera glasses with handle, ca.1910. 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.

  3. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    WW1 era Galilean type binoculars. 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. [1] Most early binoculars used Galilean optics; that is, they used a convex objective and a concave eyepiece lens.

  4. Tasco - Wikipedia

    en.wikipedia.org/wiki/Tasco

    Tasco imports binoculars with magnifications ranging between seven and ten power. They also offer Snapshot series binoculars, which include an ability to record video and capture still pictures as seen through the binoculars. Users can transfer images to a computer via a USB cable. Tasco provides software for viewing and printing photographs ...

  5. Galion, Ohio - Wikipedia

    en.wikipedia.org/wiki/Galion,_Ohio

    Galion (/ ˈ ɡ æ l j ən / GAL-yən [6]) is a city in Crawford, Morrow, and Richland counties in the U.S. state of Ohio.The population was 10,453 at the 2020 census.Galion is the second-largest city in Crawford County after Bucyrus.

  6. Eyepiece - Wikipedia

    en.wikipedia.org/wiki/Eyepiece

    It was also used in Galileo Galilei's 1609 telescope design which gave this type of eyepiece arrangement the name "Galilean". This type of eyepiece is still used in very cheap telescopes, binoculars and in opera glasses.

  7. Galileoscope - Wikipedia

    en.wikipedia.org/wiki/Galileoscope

    It is meant to be an inexpensive means by which millions of people can view the same things seen by Galileo Galilei, such as the craters of Earth's Moon, four of Jupiter's moons, and the Pleiades. The small telescope has an aperture of 50 mm (2.0 in) and a relatively long focal length of 500 mm, for a focal ratio of f/10.