Binoculars
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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 when viewing distant objects. Most binoc
8×42 roof prism binoculars with rainguard and opened tethered lens caps
WW1 era Galilean type binoculars
Porro prism binoculars, with distinctive eyepiece/objective axis offset
Binoculars diagram showing an Abbe–Koenig roof prism design
Monocular
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A monocular is a compact refracting telescope used to magnify images of distant objects, typically using an optical prism to ensure an erect image, instead of using relay lenses like most telescopic s
Binoculars
…binoculars are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military models. Unlike a (monocular) telescope, binoculars give users a three-dimensional image: each eyepiece presents a slightly different image to each of the viewer's eyes and the…
Galilean type Soviet-made miniature 2.5 × 17.5 monocular
The highest specification 8× monocular from Opticron – 8×42 DBA
Two 8× monoculars showing eye lens diameter comparison
Asika 8×42 and Visionary 12×50 showing top-wheel focusing