Distortion And Correction

Purpose

To illustrate pincushion and barrel distortion and correction thereof.

Equipment

Bright point source with condenser, ground glass screen, coarse wire mesh, iris on tilting holder and separate optical rail, 10cm focal length convex lens, iris, 10cm focal length convex lens & iris

Suggestions

This is not a really bright display, but is neat because of its application to real optical devices.

Setup Time

10 min.◙

Images

l6-42

Description

This is a two-lens system with an iris between, modeling camera or projector lenses. For the purpose of this demonstration there are apertures preceding and following the lens doublet. Closing only the preceding aperture results i n barrel distortion, and closing only the following aperture produces pincushion distortion. Closing only the aperture between the two lenses results in no distortion.See below for optical components used.◙