Binocular telescopes, or binoculars (also known as field glasses), are two identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most are sized to be held using both hands, although there are much larger types.
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Binocular coyote. Funny how little things work out, sometime. ... Took one of my birding binoculars and headed for all my favorite birding spots via my bicycle. ...www.binocularsblog.com/Binoculars Blog
Took one of my birding binoculars and headed for all my favorite birding spots via my bicycle. ... Binoculars are not the usual observing tool for planets ...binoculars-blog.com/The Ask.com Blog: Better Binoculars
Jeremy Zawodny's blog. John Battelle's Searchblog. Marketing Pilgrim ... Blog ... Initially launched in 2004, Binoculars help people find what they are ...blog.ask.com/2008/02/better-binocula.htmlOptics Blog: Thoughts and reviews of binoculars, telescopes, scopes ...
Venus and the moon in a binocular. Cornell Lab of Ornithology. Grab and go telescope ... It's one of the reasons I so dearly love my astronomy binoculars. ...www.opticsblog.com/Binoculars Review Blog
Binoculars Review Blog. RSS Feeds. Home. Bincoulars Store. Contact us ... Although night vision binoculars do indeed allow you to see in the dark, you ...www.binocularsreviewblog.com/Binocular telescopes, or binoculars (also known as field glasses), are two identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most are sized to be held using both hands, although there are much larger types.
Unlike a monocular telescope, a binocular gives users a three-dimensional image: the two views, presented from slightly different viewpoints to each of the viewer's eyes, produce a merged view with depth perception. There is no need to close or obstruct one eye to avoid confusion, as is usual with monocular telescopes.
Optical design
Galilean binoculars
Almost from the invention of the telescope in the 17th century the advantages of mounting two of them side by side for binocular vision seems to have been exploredEuropa.com — The Early History of the Binocular . Most early binoculars used Galilean optics; that is they used a convex objective and a concave eyepiece lens. The Galilean design has the advantage of presenting an erect image but has a narrow field of view and is not capable of very high magnification. This type of construction is still used in very cheap models and in opera glasses or theater glasses.
Prism binoculars
An improved image and higher magnification can be achieved in a construction binoculars employing Keplerian optics, where the image formed by the objective lens is viewed through a positive eyepiece lens (ocular). This configuration has the disadvantage that the image is inverted. There are different ways of correcting these disadvantages.
Porro prism binoculars
Roof prism binoculars
Binoculars using roof prisms may have appeared as early as the 1870s in a design by Achille Victor Emile Daubressegroups.google.co.ke photodigital.net — rec.photo.equipment.misc Discussion: Achille Victor Emile Daubresse, forgotten prism inventor. Most roof prism binoculars use either the Abbe-Koenig prism (named after Ernst Karl Abbe and Albert Koenig and patented by Carl Zeiss in 1905)Company7.com — A History Of A Most Respected Name In Optics or Schmidt-Pechan prism (invented in 1899) designs to erect the image and fold the optical path. They have objective lenses that are approximately in line with the eyepieces.
