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Zoom lens

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A zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed focal length (FFL) lens (see prime lens). [1]

54 relations: Afocal system, Angle of view, Autofocus, Beam expander, Bell & Howell, Binoculars, Camera, Chromatic aberration, Computer, Cooke Optics, Digital camera, Digital image processing, Digital zoom, Distortion (optics), F-number, Focal length, Irradiance, Laser, Lens (optics), Long-focus lens, Magnification, Microscope, Movie camera, Nikon F-mount, Normal lens, Optical instrument, Optical resolution, Optical telescope, Pan–tilt–zoom camera, Parfocal lens, Patent, Petzval field curvature, Pierre Angénieux, Prime lens, Professional video camera, Projector, Ray tracing (physics), Royal Society, Servomechanism, Single-lens reflex camera, Still camera, Superzoom, Taylor Hobson, Telephoto lens, Telescope, Telescopic sight, Tripod (photography), Varifocal lens, Video camera, View camera, ..., Wide-angle lens, Zoomar Lens, Zooming (filmmaking), 35 mm film. Expand index (4 more) »

Afocal system

In optics an afocal system (a system without focus) is an optical system that produces no net convergence or divergence of the beam, i.e. has an infinite effective focal length.

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Angle of view

In photography, angle of view (AOV) describes the angular extent of a given scene that is imaged by a camera.

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Autofocus

An autofocus (or AF) optical system uses a sensor, a control system and a motor to focus on an automatically or manually selected point or area.

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Beam expander

Beam expanders are optical devices that take a collimated beam of light and expand its size (or, used in reverse, reduce its size).

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Bell & Howell

Bell and Howell is a U.S.-based former manufacturer of motion picture machinery, founded in 1907 by two projectionists, and was originally headquartered in Wheeling, Illinois.

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Binoculars

Binoculars or field glasses are two 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.

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Camera

A camera is an optical instrument for recording or capturing images, which may be stored locally, transmitted to another location, or both.

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Christmas

Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.

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Christmas and holiday season

The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.

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Christmas Eve

Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.

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Christmas traditions

Christmas traditions vary from country to country.

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Chromatic aberration

In optics, chromatic aberration (abbreviated CA; also called chromatic distortion and spherochromatism) is an effect resulting from dispersion in which there is a failure of a lens to focus all colors to the same convergence point.

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Computer

A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming.

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Cooke Optics

Cooke Optics Ltd. is a camera lens manufacturing company based in Leicester.

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Digital camera

A digital camera or digicam is a camera that captures photographs in digital memory.

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Digital image processing

In computer science, Digital image processing is the use of computer algorithms to perform image processing on digital images.

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Digital zoom

Digital zoom is a method of decreasing the apparent angle of view of a digital photographic or video image.

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Distortion (optics)

In geometric optics, distortion is a deviation from rectilinear projection; a projection in which straight lines in a scene remain straight in an image.

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F-number

The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil.

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Focal length

The focal length of an optical system is a measure of how strongly the system converges or diverges light.

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Irradiance

In radiometry, irradiance is the radiant flux (power) received by a surface per unit area.

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Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

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Lens (optics)

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.

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Long-focus lens

In photography, a long-focus lens is a camera lens which has a focal length that is longer than the diagonal measure of the film or sensor that receives its image.

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Magnification

Magnification is the process of enlarging the appearance, not physical size, of something.

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Microscope

A microscope (from the μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument used to see objects that are too small to be seen by the naked eye.

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Movie camera

The movie camera, film camera or cine-camera is a type of photographic camera which takes a rapid sequence of photographs on an image sensor or on a film.

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New Year

New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.

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New Year's Day

New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.

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New Year's Eve

In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.

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Nikon F-mount

The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35mm format Single-lens reflex cameras.

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Normal lens

In photography and cinematography, a normal lens is a lens that reproduces a field of view that appears "natural" to a human observer.

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Optical instrument

An optical instrument either processes light waves to enhance an image for viewing, or analyzes light waves (or photons) to determine one of a number of characteristic properties.

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Optical resolution

Optical resolution describes the ability of an imaging system to resolve detail in the object that is being imaged.

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Optical telescope

An optical telescope is a telescope that gathers and focuses light, mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct view, or to make a photograph, or to collect data through electronic image sensors.

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Pan–tilt–zoom camera

A pan–tilt–zoom camera (PTZ camera) is a camera that is capable of remote directional and zoom control.

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Parfocal lens

A parfocal lens is a lens that stays in focus when magnification/focal length is changed.

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Patent

A patent is a set of exclusive rights granted by a sovereign state or intergovernmental organization to an inventor or assignee for a limited period of time in exchange for detailed public disclosure of an invention.

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Petzval field curvature

Petzval field curvature, named for Joseph Petzval, describes the optical aberration in which a flat object normal to the optical axis (or a non-flat object past the hyperfocal distance) cannot be brought properly into focus on a flat image plane.

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Pierre Angénieux

Pierre Angénieux (14 July 1907 in Saint-Héand – 26 June 1998) was a French engineer and optician, one of the inventors of the modern zoom lenses, and famous for introducing the Angénieux retrofocus.

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Prime lens

In film and photography, a prime lens is a fixed focal length photographic lens (as opposed to a zoom lens, typically with a maximum aperture from f2.8 to f1.2. The term can also mean the primary lens in a combination lens system. Confusion between these two meanings can occur if context doesn't make the interpretation clear. People sometimes use alternate terms—primary focal length, fixed focal length, or FFL to avoid ambiguity.

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Professional video camera

A professional video camera (often called a television camera even though the use has spread beyond television) is a high-end device for creating electronic moving images (as opposed to a movie camera, that earlier recorded the images on film).

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Projector

Acer projector, 2012 A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen.

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Ray tracing (physics)

In physics, ray tracing is a method for calculating the path of waves or particles through a system with regions of varying propagation velocity, absorption characteristics, and reflecting surfaces.

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Royal Society

The President, Council and Fellows of the Royal Society of London for Improving Natural Knowledge, commonly known as the Royal Society, is a learned society.

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Servomechanism

In control engineering a servomechanism, sometimes shortened to servo, is an automatic device that uses error-sensing negative feedback to correct the action of a mechanism.

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Single-lens reflex camera

A single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured.

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Still camera

A still camera is a type of camera used to take photographs.

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Superzoom

A superzoom or hyperzoom lens is a type of photographic zoom lenses with unconventionally large focal length factors, typically ranging from wide angle to extreme long lens focal lengths in one lens.

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Taylor Hobson

Taylor Hobson is an English company founded in 1886 and located in Leicester, England.

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Telephoto lens

In photography and cinematography, a telephoto lens is a specific type of a long-focus lens in which the physical length of the lens is shorter than the focal length.

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Telescope

A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).

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Telescopic sight

A telescopic sight, commonly called a scope, is an optical sighting device that is based on a refracting telescope.

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Tripod (photography)

In photography, a tripod is used to stabilize and elevate a camera, a flash unit, or other photographic equipment.

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Varifocal lens

A varifocal lens is a camera lens with variable focal length in which focus changes as focal length (and magnification) changes, as compared to parfocal ("true") zoom lens, which remains in focus as the lens zooms (focal length and magnification change).

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Video camera

A video camera is a camera used for electronic motion picture acquisition (as opposed to a movie camera, which records images on film), initially developed for the television industry but now common in other applications as well.

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View camera

A view camera is a large format camera in which the lens forms an inverted image on a ground glass screen directly at the plane of the film.

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Wide-angle lens

In photography and cinematography, a wide-angle lens refers to a lens whose focal length is substantially smaller than the focal length of a normal lens for a given film plane.

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Zoomar Lens

The Zoomar lens was the first commercially successful zoom lens, created by optical engineer Frank G. Back as an outgrowth of his research on viewfinders and variable focal length projectors for the United States military.

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Zooming (filmmaking)

Zooming in filmmaking and television production refers to the technique of changing the focal length of a zoom lens (and hence the angle of view) during a shot – this technique is also called a zoom.

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2018

2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.

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2019

2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.

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35 mm film

35 mm film (millimeter) is the film gauge most commonly used for motion pictures and chemical still photography (see 135 film).

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Optical zoom, Zoom lenses.

References

[1] https://en.wikipedia.org/wiki/Zoom_lens

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