Simultaneous Correction of Meridian Aberrations. II. Graphical Method

After establishment of the correct focal length, axial chromatic aberration, and Petzval sum, the meridian section aberrations (either third order or trigonometrically exact) of a lens system can be simultaneously corrected by a graphical method which uses data from digital traces. For a given object point and aperture zone, a lens system may afford several parameter sets which yield solutions of the problem, or there may be within a given range of parameters. The method finds all existing solutions, or, if there are none, will indicate the variations probably necessary to reach a parameter range which does contain solutions.