Variation in distortion with magnification

Abstract

The distortion introduced in t he image by a lens for a give n ax ial inclinat ion of t he chi ef ray is a linear function of t he magnification. Specifi cally, if Do re presen ts t he di stor-t ion with parall el light incident on one side of t he lens (zer o magnification) a nd D oo the distortion with parallel light incident on t h e other, t hen t he di stort ion Dm at any magn ifi ca-tion m is given by Dm= Do-mDoo. This equat ion has been expe rimen tally verified for examples of three types of symmetrical lenses.