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Index Aperture

In optics, an aperture is a hole or an opening through which light travels. [1]

80 relations: Acutance, Angle of view, Angular resolution, Antenna aperture, Aperture priority, APS-C, Astronomy, Astrophotography, Barry Lyndon, Bellows (photography), Bokeh, Camera lens, Canon EF lens mount, Canon MP-E 65mm f/2.8 1–5x Macro, Cardinal point (optics), Cinema Products Corporation, Collimated light, Condenser (optics), Cornea, Cosina Voigtländer, Critical focus, Deep focus, Depth of field, Diameter, Diaphragm (optics), Entrance pupil, Exit pupil, Exposure (photography), F-number, Film format, Film grain, Film plane, Film speed, Focal length, Focus (optics), Group f/64, Half-frame camera, Human eye, Illuminance, Image circle, Image plane, Image sensor, Iris (anatomy), Large format, Lens (optics), Lens speed, Lensbaby, Light, Lyot stop, Macro photography, ..., Micro Four Thirds system, Mirror, Numerical aperture, Objective (optics), Optical aberration, Optical microscope, Optics, PDF, Pentax Spotmatic, Photographic film, Photography, Photometry (astronomy), Pinhole camera, Pupil, Ray (optics), Sampling (signal processing), Shallow focus, Shutter speed, Single-lens reflex camera, Sony Cyber-shot DSC-RX10, Stanley Kubrick, Star, Telephoto lens, Telescope, Through-the-lens metering, Tilt–shift photography, Vignetting, Z-scan technique, 135 film, 35 mm equivalent focal length. Expand index (30 more) »


In photography, the term "acutance" describes a subjective perception of sharpness that is related to the edge contrast of an image.

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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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Angular resolution

Angular resolution or spatial resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution.

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Antenna aperture

In electromagnetics and antenna theory, antenna aperture, effective area, or receiving cross section, is a measure of how effective an antenna is at receiving the power of electromagnetic radiation (such as radio waves).

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Aperture priority

Aperture priority, often abbreviated A or Av (for aperture value) on a camera mode dial, is a setting on some cameras that allows the user to set a specific aperture value (f-number) while the camera selects a shutter speed to match it that will result in proper exposure based on the lighting conditions as measured by the camera's light meter.

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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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Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.

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Astrophotography is a specialized type of photography for recording photos of astronomical objects, celestial events, and areas of the night sky.

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Barry Lyndon

Barry Lyndon is a 1975 British-American period drama film by Stanley Kubrick, based on the 1844 novel The Luck of Barry Lyndon by William Makepeace Thackeray.

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Bellows (photography)

In photography, a bellows is the accordion-like, pleated expandable part of a camera, usually a large or medium format camera, to allow the lens to be moved with respect to the focal plane for focusing.

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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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Camera lens

A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.

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Canon EF lens mount

Introduced in 1987, the EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras.

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Canon MP-E 65mm f/2.8 1–5x Macro

The MP-E 65mm Macro f/2.8 is a photographic lens that was released in September 1999 and is manufactured by Canon for use on the EOS photographic system.

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Cardinal point (optics)

In Gaussian optics, the cardinal points consist of three pairs of points located on the optical axis of a rotationally symmetric, focal, optical system.

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Cinema Products Corporation

Cinema Products Corporation was an American manufacturer of motion picture camera equipment.

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Collimated light

Collimated light is light whose rays are parallel, and therefore will spread minimally as it propagates.

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Condenser (optics)

A condenser is an optical lens which renders a divergent beam from a point source into a parallel or converging beam to illuminate an object.

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The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.

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Cosina Voigtländer

Cosina Voigtländer refers to photographic products manufactured by Cosina under the Voigtländer name since 1999.

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Critical focus

In a photograph, the area of critical focus is the portion of the picture that is optically in focus.

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Deep focus

Deep focus is a photographic and cinematographic technique using a large depth of field.

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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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In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

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Diaphragm (optics)

In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center.

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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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Exit pupil

In optics, the exit pupil is a virtual aperture in an optical system.

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Exposure (photography)

In photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance.

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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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Film grain

Film grain or granularity is the random optical texture of processed photographic film due to the presence of small particles of a metallic silver, or dye clouds, developed from silver halide that have received enough photons.

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Film plane

A film plane is the area inside any camera or image taking device with a lens and film or digital sensor upon which the lens creates the focused image.

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Film speed

Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system.

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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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Group f/64

Group f/64 was a group founded by seven 20th-century San Francisco photographers who shared a common photographic style characterized by sharp-focused on and carefully framed images seen through a particularly Western (U.S.) viewpoint.

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Half-frame camera

A half-frame camera is a camera using a film format at half the intended exposure format.

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Human eye

The human eye is an organ which reacts to light and pressure.

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In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

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Image circle

The image circle is the cross section of the cone of light transmitted by a lens or series of lenses.

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Image plane

In 3D computer graphics, the image plane is that plane in the world which is identified with the plane of the monitor.

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Image sensor

An image sensor or imaging sensor is a sensor that detects and conveys the information that constitutes an image.

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Iris (anatomy)

In humans and most mammals and birds, the iris (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.

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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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Lens (optics)

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

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Lens speed

Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens.

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Lensbaby is a line of camera lenses for SLR cameras that combine a simple lens with a bellows or ball and socket mechanism for use in special-effect photography.

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Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.

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Lyot stop

A Lyot stop is an optic stop, invented by French astronomer Bernard Lyot, that reduces the amount of flare caused by diffraction of other stops and baffles in optical systems.

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Macro photography

Macro photography (or photomacrography or macrography, and sometimes macrophotography), is extreme close-up photography, usually of very small subjects and living organisms like insects, in which the size of the subject in the photograph is greater than life size (though macrophotography technically refers to the art of making very large photographs).

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Micro Four Thirds system

The Micro Four Thirds system (MFT or M4/3) is a standard released by Olympus and Panasonic in 2008, for the design and development of mirrorless interchangeable lens digital cameras, camcorders and lenses.

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A mirror is an object that reflects light in such a way that, for incident light in some range of wavelengths, the reflected light preserves many or most of the detailed physical characteristics of the original light, called specular reflection.

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Numerical aperture

In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.

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Objective (optics)

In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image.

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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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Optical microscope

The optical microscope, often referred to as the light microscope, is a type of microscope that uses visible light and a system of lenses to magnify images of small subjects.

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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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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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Pentax Spotmatic

The Pentax Spotmatic refers to a family of 35mm single-lens reflex cameras manufactured by the Asahi Optical Co.

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Photographic film

Photographic film is a strip or sheet of transparent plastic film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals.

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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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Photometry (astronomy)

Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.

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Pinhole camera

A pinhole camera is a simple camera without a lens but with a tiny aperture, a pinhole – effectively a light-proof box with a small hole in one side.

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The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina.

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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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Sampling (signal processing)

In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal.

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Shallow focus

Shallow focus is a photographic and cinematographic technique incorporating a small depth of field.

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Shutter speed

In photography, shutter speed or exposure time is the length of time when the film or digital sensor inside the camera is exposed to light, also when a camera's shutter is open when taking a photograph.

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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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Sony Cyber-shot DSC-RX10

The Sony Cyber-shot DSC-RX10 is a digital superzoom bridge camera made by Sony.

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Stanley Kubrick

Stanley Kubrick (July 26, 1928 – March 7, 1999) was an American film director, screenwriter, and producer.

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A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

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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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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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Through-the-lens metering

In photography, through-the-lens (TTL) metering refers to a feature of cameras whereby the intensity of light reflected from the scene is measured through the lens; as opposed to using a separate metering window or external hand-held light meter.

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Tilt–shift photography

Tilt–shift photography is the use of camera movements on small- and medium-format cameras, and sometimes specifically refers to the use of tilt for selective focus, often for simulating a miniature scene.

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In photography and optics, vignetting (vignette) is a reduction of an image's brightness or saturation toward the periphery compared to the image center.

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Z-scan technique

In nonlinear optics z-scan technique is used to measure the non-linear index n2 (Kerr nonlinearity) and the non-linear absorption coefficient Δα via the "closed" and "open" methods, respectively.

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135 film

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

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35 mm equivalent focal length

In photography, the 35 mm equivalent focal length is a measure that indicates the angle of view of a particular combination of a camera lens and film or sensor size.

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Redirects here:

Apature, Aperature, Aperture Stop, Aperture factor, Aperture stop, Apertures, Clear aperture, Lens aperture, Optimal aperture.


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

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