Of all the optical instruments, binoculars are widely used by travelers, sports fans, fisherman and hunters.
Binoculars are mounted side by side and aligned to point with accuracy in the same direction. Unlike the single lens telescope, binoculars or binocular telescopes, allows the viewer a greater sense of distance and depth. Binoculars give the users an apparently 3D image.
Binoculars are so designed that the focal length of the lenses is less than is physical length. Larger binoculars can not be held steady hence they are mounted on a support such as tripod. The Large Binocular Telescope, known as LBT is located in Arizona and it produced the First Light image from outer space in October 26, 2005.
Coin operated binoculars which are mounted on a pedestal are found in popular tourism spots to help the tourists get a closer view of the sights. By dropping one or two quarters in it, it permits the use of the binoculars for 2 to 3 minutes
A good binocular should produce two sharp images which are uniform, each image having excellent quality, free from geometrical errors or internal reflections and color corrections. Both the images right and left ...
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