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In geometric optics, distortion is a deviation from rectilinear projection; a projection in which straight lines in a scene remain straight in an image.It is a form of optical aberration that may be distinguished from other aberrations such as spherical aberration, coma, chromatic aberration, field curvature, and astigmatism in a sense that these impact the image sharpness without changing an ...
The reverse, in which the perimeter is magnified more than the center, is known as "pincushion distortion" (figure 3b). This effect is called lens distortion or image distortion, and there are algorithms to correct it. Systems free of distortion are called orthoscopic (orthos, right, skopein to look) or rectilinear (straight lines). Figure 4
In other words, it is a lens with little or no barrel or pincushion distortion. At particularly wide angles, however, the rectilinear perspective will cause objects to appear increasingly stretched and enlarged as they near the edge of the frame. These types of lenses are often used to create forced perspective effects.
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Fig. 2b: An instrumental pincushion distortion of = leads to an almost complete elimination of the globe effect. The image of an afocal optical instrument is distortion-free if the f-tan theta condition, also known as tangent condition and first defined by Bow and Sutton in 1861, is satisfied: [4] = .
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[186] [187] Old glass which is thicker at the bottom than at the top comes from the production process, not from slow flow; [186] [187] no such distortion is observed in other glass objects of similar or even greater age. [186] [187] [188] Diamonds are not formed from highly compressed coal.
Vitaly Borker (born 1975 or 1976 in the former Soviet Union), known by pseudonyms Tony Russo, Stanley Bolds and Becky S, is an American felon who has twice served federal prison sentences for charges arising from how he ran his online eyeglass retail and repair sites, DecorMyEyes and OpticsFast. [4]