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.
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- 2020 Lornetka Baigish 8x30.jpg
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- Commons category
- Binoculars
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- Binoculars
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- wordnet-rdf.princeton.edu/wn30/02841315-n
- native label
- binocle
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~58 min read
Article
48 sectionsContents
- 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.