Laurence, Lionel · London, School of Optics · leaf 248
ompressed rela-tively more at the corners, which lie furthest from the principal axis, than atthe sides. The virtual image of a square seen through a Cx. lens is said tosuffer from positive or pincushion distortion, as in Fig. 248, this being thereversal of the barrel distortion of the real image.… … Fig. 250. Fig. 251. Influence of a Stop.—A diaphragm used with a lens, or combination,diminishes spherical aberration, coma, astigmatism and curvature of field.This accentuates and brings into prominence distortion, so that rectilinearlines of the object near the margin appear curved in the image.…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
