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binoculars

Also known as binocular telescope, field glasses

thumb|upright=1.35|8×42 roof prism binoculars with #Accessories|rainguard and opened tethered lens caps

AI overview

Binoculars are optical instruments that use lenses and prisms to magnify distant objects, allowing both eyes to view them simultaneously. They are useful tools for activities like wildlife observation, sports viewing, and astronomy where seeing faraway details clearly is important.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Image: 2020 Lornetka Baigish 8x30.jpg

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Commons category: Binoculars
Commons gallery: Binoculars
exact match: wordnet-rdf.princeton.edu/wn30/02841315-n
native label: binocle

Sources (1)

wikidata.org

via Wikidata · CC0

~58 min read

Article

48 sections

Contents

Optical design evolution
Galilean
Keplerian
Erecting lenses
Prism
Porro
Roof
Optical systems and their practical effect on binoculars housing shapes
Optical parameters
Magnification
Objective diameter
Field of view
Exit pupil
Twilight factor and relative brightness
Eye relief
Close focus distance
Eyepieces
Field flattener lens
Mechanical design
Focus and adjustment
Interpupillary distance
Alignment
Image stability
Housing
Optical coatings
Anti-reflective
Phase correction
Metallic mirror
Dielectric mirror
Terms
All binoculars
Roof prisms only
Accessories
Applications
General use
Land surveys and geographic data collection
Bird watching
Hunting
Range finding
Military
Marine
Astronomical
List of binocular manufacturers
See also
Notes
References
Further reading
External links

thumb|upright=1.35|8×42 roof prism binoculars with #Accessories|rainguard and opened tethered lens caps

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 (binocular vision) when viewing distant objects. Most binoculars are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military models.