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Circle of confusion

Index Circle of confusion

In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. [1]

39 relations: Advanced Photo System, Airy disk, Aperture, APS-C, Bokeh, Defocus aberration, Depth of field, Diffraction, Encircled energy, Entrance pupil, F-number, Film format, Focal cloud, Focal length, Focus (optics), Four Thirds system, Geometrical optics, Henry Coddington, Hyperfocal distance, Image resolution, John Henry Dallmeyer, Large format, Medium format (film), Moritz von Rohr, Nikon 1 series, Nikon DX format, Optical aberration, Optics, Paraxial approximation, PDF, Photography, Point spread function, Ray (optics), Snellen chart, Society for the Diffusion of Useful Knowledge, Thomas Rudolphus Dallmeyer, Visual acuity, William de Wiveleslie Abney, 135 film.

Advanced Photo System

Advanced Photo System (APS) is a discontinued film format for still photography first produced in 1996.

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Airy disk

In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light.

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Aperture

In optics, an aperture is a hole or an opening through which light travels.

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APS-C

Advanced Photo System type-C (APS-C) is an image sensor format approximately equivalent in size to the Advanced Photo System "classic" negatives of 25.1×16.7 mm, an aspect ratio of 3:2.

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Bokeh

In photography, bokeh (— also sometimes pronounced as) is the aesthetic quality of the blur produced in the out-of-focus parts of an image produced by a lens.

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Defocus aberration

In optics, defocus is the aberration in which an image is simply out of focus.

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Depth of field

In optics, particularly as it relates to film and photography, the optical phenomenon known as depth of field (DOF), is the distance about the Plane of Focus (POF) where objects appear acceptably sharp in an image.

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Diffraction

--> Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit.

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Encircled energy

The optics term encircled energy refers to a measure of concentration of energy in an optical image, or projected laser at a given range.

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Entrance pupil

In an optical system, the entrance pupil is the optical image of the physical aperture stop, as 'seen' through the front of the lens system.

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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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Film format

A film format is a technical definition of a set of standard characteristics regarding image capture on photographic film, for either stills or filmmaking.

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Focal cloud

A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic.

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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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Focus (optics)

In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge.

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Four Thirds system

The Four Thirds System is a standard created by Olympus and Eastman Kodak for digital single-lens reflex camera (DSLR) and mirrorless camera design and development.

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Geometrical optics

Geometrical optics, or ray optics, describes light propagation in terms of rays.

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Henry Coddington

Henry Coddington (1798/9, Oldbridge, County Meath — 3 March 1845, Rome) was an English natural philosopher, fellow and tutor of Trinity College, Cambridge and Church of England clergyman.

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Hyperfocal distance

In optics and photography, hyperfocal distance is a distance beyond which all objects can be brought into an "acceptable" focus.

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Image resolution

Image resolution is the detail an image holds.

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John Henry Dallmeyer

John Henry Dallmeyer (6 September 183030 December 1883), Anglo-German optician, was born at Loxten, Westphalia, the son of a landowner.

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Large format

Large format refers to any imaging format of 4×5 inches (102×127 mm) or larger.

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Medium format (film)

Medium format has traditionally referred to a film format in still photography and the related cameras and equipment that use film.

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Moritz von Rohr

Moritz von Rohr (4 April 1868 – 20 June 1940) was an optical scientist at Carl Zeiss in Jena, Germany.

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Nikon 1 series

The Nikon 1 series are high-speed mirrorless interchangeable-lens cameras with 60 frames per second (fps) continuous shooting speed, using Nikon 1-mount lenses and announced on 21 September 2011.

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Nikon DX format

The Nikon DX format is an alternative name used by Nikon corporation for APS-C image sensor format being approximately 24x16 mm.

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Optical aberration

Aberration in optics refers to a defect in a lens such that light is not focused to a point, but is spread out over some region of space, and hence an image formed by a lens with aberration is blurred or distorted, with the nature of the distortion depending on the type of aberration.

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Optics

Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it.

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Paraxial approximation

In geometric optics, the paraxial approximation is a small-angle approximation used in Gaussian optics and ray tracing of light through an optical system (such as a lens).

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PDF

The Portable Document Format (PDF) is a file format developed in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

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Photography

Photography is the science, art, application and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film.

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Point spread function

The point spread function (PSF) describes the response of an imaging system to a point source or point object.

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Ray (optics)

In optics a ray is an idealized model of light, obtained by choosing a line that is perpendicular to the wavefronts of the actual light, and that points in the direction of energy flow.

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Snellen chart

A Snellen chart is an eye chart that can be used to measure visual acuity.

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Society for the Diffusion of Useful Knowledge

The Society for the Diffusion of Useful Knowledge (SDUK), was founded in 1826, mainly at the instigation of Lord Brougham, with the object of publishing information to people who were unable to obtain formal teaching, or who preferred self-education.

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Thomas Rudolphus Dallmeyer

Thomas Rudolphus Dallmeyer (16 May 1859 – 25 December 1906),"Obituary; Thomas Rudolphus Dallmeyer" (1907) The Photographic Journal, Vol.

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Visual acuity

Visual acuity (VA) commonly refers to the clarity of vision.

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William de Wiveleslie Abney

Sir William de Wiveleslie Abney, KCB, FRS (24 July 1843 – 3 December 1920) was an English astronomer, chemist, and photographer.

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135 film

135 is photographic film in a film format used for still photography.

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Redirects here:

Acceptable circle of confusion, Circle of confusion computation, Circle of confusion diameter limit, Circle of least confusion.

References

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

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