An equation has been developed that predicts the average size of the spot diagram over the field of view of a lens. The equation is based on an analytic integration of Buchdahl’s aberration polynomials, and is used to supply the figure of merit in an automatic correction computer program. The equation results in aberration balancing through the seventh order, and combines the procedures of optimization and analysis for designers who utilize the geometric spot size as an image quality criterion.
© 1976 Optical Society of America
Paul N. Robb, "Analytic merit function based on Buchdahl’s aberration coefficients," J. Opt. Soc. Am. 66, 1037-1041 (1976)