Astigmatism

Astigmatism

Lens aberration making a single point light source impossible to focus as a true point.

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Part of Speech: noun
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Industry/Domain: Photography
Category: Professional photography
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Related terms

astigmatism

Medical; Illness

A condition of the eye in which the curve of the cornea or lens is uneven. In astigmatism, light coming into the eye is not focused properly on the retina.

astigmatism

Engineering; Electronic engineering

A focusing fault in a cathode-ray tube (CRT), in which electrons in different axial planes focus at different points.

astigmatism

Medical; Human genome

1) Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less ...

astigmatizer

Earth science; Mapping science

A lens which introduces astigmatism into an optical system. An astigmatizer is usually mounted so that it can be moved into or out of the optical path at will. In a sextant, ...

astigmatism

Health care; Optometry

Condition in which the cornea's curvature is asymmetrical (the eye is shaped like a football or egg instead of a baseball); light rays are focused at two points on the retina ...

astigmatism

Photography; Professional photography

lens aberration making a single point light source impossible to focus as a true point.

rubber lens-mount gasket

Photography; Professional photography

A flexible rubber gasket that forms a seal between the lens and the camera body.

subject-to-camera distance information

Photography; Professional photography

The data supplied to the camera by the lens indicating the distance from the camera to the subject. This information makes possible advances like 3D Color Matrix Metering II and ...

vignetting

Photography; Professional photography

A loss of brightness or saturation at the periphery of an image; usually not desired, but sometimes used to create a vignette framing the subject at the center of the image.

special effects mode

Photography; Professional photography

A mode in which the user can create artistic results simply by adding special effects to still images and movies. To select an effect, the user rotates the mode dial to EFFECTS ...

still picture

Photography; Professional photography

A photograph (static image) as opposed to a movie (moving picture).

stop-motion

Photography; Professional photography

Generic term for an animation technique which makes static objects appear to move. This is done by recording each movement of the object as an individual frame, when each frame ...