pincushion distortion


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Related to pincushion distortion: Barrel Distortion

pincushion distortion

(pin -kû-shŏn) See distortion.

pincushion distortion

[′pin‚ku̇sh·ən di‚stȯr·shən]
(electronics)
Distortion in which all four sides of a received television picture are concave (curving inward).
(optics)
Aberration in which the magnification produced by an optical system increases with the distance of the object point from the optical axis, so that the image of a square has concave sides.
References in periodicals archive ?
During testing, I detected neither barrel nor pincushion distortion. Piercing counter-light did generate some minor internal reflections.
Stars appeared as pinpoints across the entire field; there wasn't a hint of false color around even the brightest stars; and there was only a touch of pincushion distortion, meaning that round objects won't stretch into ovals as you sweep them across the field.
I could detect no barrel or pincushion distortion, or any rolling distortion at any power from 3.5-21X, which by the way is a 6X factor range.
Under critical examination, the 120 [degrees] Explore eyepiece reveals a modest amount of pincushion distortion. This causes the Moon and planets to appear slightly distorted at the edge of the field, and when you're sweeping the sky, stars appear to move more slowly at the edge of the field than they do at the center.
Before then the occasional optics article was usually a rewrite of a pamphlet published by Bausch & Lomb in the 1950s, explaining such optical terms as pincushion distortion, thus providing zero practical knowledge to the reader.