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binoculars US English

An optical instrument with a lens for each eye, used for viewing distant objects

porro-prism binoculars in porro prism US English

A pair of binoculars using two porro prisms at right angles, resulting in a conventional instrument with objective lenses that are further apart than the eyepieces

roof-prism binoculars in roof prism US English

A pair of binoculars using two roof prisms, resulting in an instrument with parallel sides and objective lenses that are the same distance apart as the eyepieces