Ĭoncave (minus) spherical lenses tend to have barrel distortion. In a zoom lens, barrel distortion appears in the middle of the lens's focal length range and is worst at the wide-angle end of the range. Fisheye lenses, which take hemispherical views, utilize this type of distortion as a way to map an infinitely wide object plane into a finite image area. The apparent effect is that of an image which has been mapped around a sphere (or barrel). Barrel distortion In barrel distortion, image magnification decreases with distance from the optical axis. These radial distortions can usually be classified as either barrel distortions or pincushion distortions. Although distortion can be irregular or follow many patterns, the most commonly encountered distortions are radially symmetric, or approximately so, arising from the symmetry of a photographic lens.
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