We compute the radius and the position of the center of the circle of least confusion, in an exact way and by using the third-order approximation, of a rotationally symmetric mirror when the point source is located at any position on the optical axis. For the spherical case we find that for some positions of the point source there is a considerable difference between the exact computations and those obtained by working up to third-order aberrations.
© 2001 Optical Society of America
G. Silva-Ortigoza, J. Castro-Ramos, and A. Cordero-Dávila, "Exact Calculation of the Circle of Least Confusion of a Rotationally Symmetric Mirror. II," Appl. Opt. 40, 1021-1028 (2001)