n
(film) The filmmaking principle that the perspective of the camera should remain on one side of an imaginary line so that subjects maintain their spatial relationship.
n
(optics) The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; a defect in a focusing mechanism that prevents the intended focal point.
n
(photography) The angular extent of a given scene as imaged by a camera.
n
(optics, astronomy) A diverging lens which, used in series with other optics in an optical system, increases the effective focal length of an optical system as perceived by all components that are after it in the system.
adj
Furnished with mirrors; full of mirrors.
n
Alternative form of brachistochrone [(mathematics) A cycloid; the curve of fastest descent between two points.]
n
A large convex lens or concave mirror that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface.
n
An adjusted value of the equivalent focal length, so computed as to equalize the positive and negative values of distortion over the entire field used in a camera.
n
A catopter, or reflecting glass.
n
(optics) A lens having at least one convex surface, such that light passing through it may be brought to a focus.
adj
(image) Created by combining two images
n
(optics) The distance by which the focal point is in front of (positive defocus) or beyond (negative defocus) the image or target surface.
n
In photography, the distance in front of and behind the subject that appears to be in focus.
adj
(audio engineering) Having separate and independent channels of audio, as opposed to multiplexed stereo or quadraphonic, or other multi-channel sound.
n
A device that counts objects in three dimensions (two orthogonal planes)
n
A placard with the capital letter E printed on it in various orientations and sizes, designed to test distance vision.
adj
echographically reflective
n
(optics) A ray that has a specific destination
adj
(optics, of a lens) Having surfaces with the same radius of curvature.
n
(photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.
n
(optics) a positive-powered lens or group of lenses that comes after the objective lens and before the image plane or the eyepiece, serving to change the size of the image
n
(optics) The angular extent of what can be seen, either with the eye or with an optical instrument or camera.
n
The area that a person, an animal, etc., can see with its eyes (or each eye individually) without turning the head.
n
(optics) The aperture that limits the field of view of a lens.
n
(countable) A drawing produced in this style.
n
(optics) A flat portion of a lens or curved mirror, especially one introduced accidentally or by damage.
n
(optics) The field of view of a camera that is in sharp focus.
n
(optics) A measure of how strongly an optical system converges or diverges light, the inverse of optical power. In the simple case of a single convex lens, it is the distance along the optical axis from the principal plane of the lens to the lens's focal point (where, for instance, the film would be placed in a camera). For more complex or multi-element optical systems, focal length need not correspond to any obvious measurable physical distance.
n
(optics) Any plane perpendicular to the axis of a lens or mirror.
n
(optics) A focus; a point at which rays of light or other radiation converge.
n
(optics) Putting into focus.
n
Alternative form of focuser [A device which allows one to adjust the focus of an instrument such as a telescope.]
n
An optical system in which prisms and/or mirrors are used to reduce the overall physical length of the system.
v
To render the image of an object such that it appears to be receding in space as it is perceived visually.
n
Initialism of field of view. [(optics) The angular extent of what can be seen, either with the eye or with an optical instrument or camera.]
v
(photography) To use a wide-angle lens to take one or more photographs.
n
(specifically, optics, Britain) A reticle.
n
(video games, uncountable) A glitch in some three-dimensional games where a missing texture prevents part of the scene from being rendered correctly, causing a trail of previously rendered frames to appear instead.
n
(electronics) The ability of a system to reproduce loud sounds free of distortion; dynamic headroom.
adj
(photography) Describing the distance on which a camera must be focused in order to achieve the maximum depth of field
v
(intransitive) To move in shifting (and often attractive or colourful) patterns.
n
The capacity to see full-color (if muted) images solely by looking at a photograph with red and gray wavelengths.
n
The focussing of light as if by a lens.
n
A picture made using lenticular printing where different images appear from different viewing angles.
n
Alternative form of looking-glass. [(dated) Synonym of mirror (“smooth surface that reflects light so as to give an image of what is in front of it”).]
n
The reduction in apparent size of objects viewed through a lens or mirror shaped so as to increase the field of view, such as a convex or aspheric mirror or a Fresnel lens.
v
To reduce in apparent size, as for example objects viewed through a lens or mirror shaped so as to increase the field of view, such as a convex or aspheric mirror or a Fresnel lens.
n
(historical) A kind of political self-help book, advising kings, princes, etc. on how to behave.
n
A concept concerning the structure of human subjectivity and the imaginary order in the psychoanalytic theory of Jacques Lacan.
n
(photography) A mirrorless interchangeable-lens camera, similar to a digital SLR, but usually made smaller by incorporating an electronic viewfinder instead of a mirror and prism.
n
sunglasses with a reflective coating on the outside of the lenses
adj
Resembling a mirror; reflective
n
The application of multiple coatings, especially in producing a camera lens.
n
A glass with a number of facets, causing an object to appear multiplied many times.
n
A lens with a number of facets, causing an object to appear multiplied many times.
adj
In loudspeaker acoustics, referring to a region where the intensity of direct, unreflected sound from the source (such as a loudspeaker) is significantly dominant over any indirect or reflected sound.
n
(sound, headphones) the active cancellation of outside noise by creation of an inverse waveform to null out noise soundwaves within the subject environment
n
(optics) An imaginary line within an optical system around which there is rotational symmetry.
n
(dated) A vision or image that is deceptive or misleading, such as an optical illusion or a trick of the light.
n
The degree to which a lens, mirror, or other optical system converges or diverges light, equal to the reciprocal of the focal length of the device.
n
(photography, optics, informal) A type of flat lens design.
adj
(optics) Alternative form of parfocal [Having multiple lenses that have corresponding focal points in the same plane.]
n
The process of making something parfocal.
n
The appearance of depth in objects, especially as perceived using binocular vision.
adj
(optics, of a lens) Having one side plane and the other concave
adj
(optics, of a lens) Having one side plane and the other convex.
n
A reflection prism used in optical instruments to alter the orientation of an image. It consists of a block of glass shaped as a right geometric prism with right-angled triangular end faces.
n
A device that changes the apparent direction that a sound comes from
n
(optics) The image formed by light rays converging from a convex lens or concave mirror
n
The ability of a television or monitor to display all colours and grey tones accurately.
v
(digital image processing) To estimate a camera projection matrix from known position data and image entities.
n
The input sound level that creates the same output voltage as the receiving microphone in the absence of any sound, and which represents the lowest point of the microphone's dynamic range.
adj
(photography) Denoting or relating to a type of camera which allows the photographer to view the subject through the same lens that will be used to take a photograph, usually by incorporating a moving mirror and prism.
n
(photography) The blur produced by spherical aberration in a lens, sometimes deliberately used to produce a dreamy effect or to eliminate blemishes.
n
(acoustics) a subjective unit of loudness for an average listener equal to the loudness of a 1000-hertz sound that has an intensity 40 decibels above the listener's own threshold of hearing
n
The science and technology of sound.
n
(photography) The ratio of the focal length to the diameter of a photographic objective.
n
The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.
n
A form of cardioid that has an additional lobe, used in some microphones.
n
(medicine, informal) The neuromuscular blockade monitoring method described above.
n
The vibrating hammer, or spring contact piece of a hammer break, as of the electric ignition apparatus for an internal combustion engine.
n
The reciprocal of the focal distance of a lens, used as a measure of the divergence or convergence of a pencil of rays.
n
(optics) The point where the surface of a lens crosses the optical axis.
n
The more or less conical region of space from which an observer can see a given display without distortion.
n
(optics) A point from which light (or other radiation) apparently emanates, such as in the virtual image produced by a plane mirror.
n
(optics) The image formed by light rays diverging from a convex mirror or concave lens
n
field of vision, field of view
adj
Alternative form of widefield [(microscopy) In which a whole two-dimensional image is acquired simultaneously using a wide-area detector array.]
n
Either of a pair of mirrors on the sides of a car or other vehicle that enable the driver to see to the side and behind.
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