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8×42 roof prism binoculars with rainguard and opened tethered lens caps. 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.
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.
For example, when a person sees an organ through inverted [clarification needed] binoculars, it looks smaller than it really is, which may reduce the pain connected to that organ. Ten patients with persistent discomfort in their right arms that was exacerbated by movement were instructed to move their arms while their visual impressions of ...
David Pearsall Bushnell (1913–2005) was an American entrepreneur who founded the Bushnell optics company in 1948. Bushnell made precision binoculars affordable to middle-class Americans for the first time through a strategy of importing from manufacturers who provided optics to his patented specifications.
Steiner was the first company to produce nitrogen-filled binoculars. [6] In 1989, Steiner-Optik received by its own account until then the world's largest order for military binoculars, which included the delivery of 72,000 M22 7×50 binoculars to the US Army. [ 7 ]
Zeiss trench periscope used by Major General William Sinclair-Burgess of the First Australian Imperial Force. An agent from the British Ministry of Munitions was sent to neutral Switzerland to carry out secret negotiations with the Germans, through Swiss intermediaries, for the exchange of optical instruments for natural rubber.
Binocular rivalry was discovered by Porta. [6] Porta put one book in front of one eye, and another in front of the other. He reported that he could read from one book at a time and that changing from one to the other required withdrawing the "visual virtue" from one eye and moving it to the other.
Double Porro prism systems are used in small optical telescopes to re-orient an inverted image (an arrangement is known as an image erection system), and especially in many binoculars where they both erect the image and provide a longer, folded distance between the objective lenses and the eyepieces. When there is an air gap between the two ...
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