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Distortion is exceptionally well corrected given the 114° angle of view. However, distortion should be understood as consisting of three distinct phenomena:

Perspective distortion

Perspective distortion is not really distortion at all; an object imaged at a distance of 1/2 meter is four times as large (twice linearly) as the same object imaged at a distance of one meter. The same object is imaged 16 times larger at a distance of 1/2 meter as at 2 meters!

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diglloyd Advanced Photography

diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.

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Geometric distortion
(the blob at lower left is “finger distortion”!)

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