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  • binocular Designating any instrument in which both eyes can be used to view the image to achieve a stereoscopic effect, or merely to facilitate observation. See also prism binocular.
  • prism binoculars A pair of telescopes with prismatically erected images, mounted side by side with the eyepieces at the interocular distance of the observer. This separation is adjustable with a convenient millimeter scale. The separation of the objective lenses is...
  • infrared binoculars An instrument, similar in design to regular binoculars, that can transmit and enlarge infrared images.
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