Spherical aberration is an optical effect observed in an optical device (lens, mirror, etc.) that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike nearer the centre. It signifies a deviation of the device from the...
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http://en.wikipedia.org/wiki/Spherical_aberration
(from the article `optics`) The first term in the OPD expression is OPD = 1(02 + 02)2. Hence...appreciated until a century later, when the English optician Jesse Ramsden found that this design reduces blurring of the image caused by the ... In spherical aberration, rays of light from a point on the optical axis of a lens having spherica...
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http://www.britannica.com/eb/a-z/s/139
the variation of focus with aperture in which a ray through the edge of the lens intersects the axis at a point other than the paraxial focus.
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http://www.chemistry-dictionary.com/definition/spherical+aberration.php
Spherical aberration results from a spherical mirror (left) but not from a parabolic mirror (right). Credit: star-optics.com A defect of spherical mirrors and some lenses and eyepieces that causes parallel light rays striking the element at different distances from the optical axis to be brough...
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a focus defect in which electrons, at different radial distances from the axis, focus at different axial distances
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Lens aberration where rays entering a lens at different positions come to a focus at different points. Often seen when focussing into a thick specimen with oil immersion objectives (
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<microscopy> A lens defect in which image forming rays passing through the outer zones of the lens focus at a distance from the principal plane, different from that of the rays passing through the centre of the lens. ... The aberration caused by (near-paraxial) monochromatic light rays or electron beams passing through different radii of a le...
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Light passing through a convex lens will be brought to different focus depending upon whether the light passes through near the center of the lens or closer to the periphery. Lens designers strive to correct this kind of zonal aberration to bring peripheral and near-central rays to a common focus
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Deficiency in simple lenses in which the image is sharp in the centre but out-of-focus at the periphery of the field, more a problem when taking photographs than when observing directly. Lenses compensated for this defect are referred to as plan- lenses (eg. planapochromat).
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This is the distortion to the view, seen through a telescope. It is due to the lenses being inappropriate for the design of telescope. 'Barrel distortion' is a curvature of the view, where the top, bottom and sides of a flat object, such as a wall, seem to bulge outward. The opposite type of distortion is called 'pin-cushion' distortion
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Light passing through a convex lens will be brought to different focus depending upon whether the light passes through near the center of the lens or closer to the periphery. Lens designers strive to correct this kind of zonal aberration to bring peripheral and near-central rays to a common focus.
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http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
[
n] - a optical aberration resulting in a distorted image
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A defect caused by grinding the surface of a lens or mirror to a spherical rather than a parabolic shape. See also: Aberration.
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noun a optical aberration resulting in a distorted image
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https://www.encyclo.co.uk/local/20974
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