Popis: |
An effective procedure for the optimum balancing of aberrations in non-diffraction-limited lenses is an important and unsolved problem in lens design. In order to obtain an understanding of what is involved, an empirical study was conducted for the case of optimizing the modulation transfer function (MTF) in the presence of spherical aberration. The results of this study indicated the reason why direct optimization of the MTF is probably not a very good approach, and also suggested a possible method for accomplishing this balancing based on the Rayleigh quarter-wavelength rule, and using Jacobi orthogonal polynomials, of which the Zernike polynomials are a special case. |