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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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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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

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