Binoculars

Binoculars have, in most part, been designed for hunters, and bird watchers. There are also larger aperture binoculars used by astronomers. Various prism layouts has been invented to make them more compact, and to reduce aberrations. Because of their magnification, and larger that pupil objective lenses, they magnify both stereoscopic effect, and brightness of the subject. The porro-prism design also doubles the eye distance, further increasing the stereoscopic effect of nature scenes. Mountains look almost flat to the naked eye beyond 300 meters. Binoculars would spread them out in depth up to a few kilometers.

Carl Zeiss 8x50

Zeiss 8x30

Leica 8x50 BA

Opera Glases

Zeiss 10x25

Leica Trinovid 10x40

Optomex

See the full story on binoculars,

Jan-March 2021 issue of Optomechanix:

Technical Forum: https://www.birdforum.net/threads/new-horizons-ii.378895/page-12#post-4117585