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
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
History of the telescope
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The history of the telescope can be traced to before the invention of the earliest known telescope, which appeared in 1608 in the Netherlands, when a patent was submitted by Hans Lippershey, an eyegla
Monocular
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Early depiction of a "Dutch telescope" from 1624.
Optical diagram showing light being refracted by a spherical glass container full of water, from Roger Bacon, De multiplicatione specierum
Notes on Hans Lippershey's unsuccessful telescope patent in 1608
Reproduction of one of the four optical devices that Zacharias Snijder in 1841 claimed were early telescopes built by Zacharias Janssen. Its actual function and creator has been disputed over the years.