It is frequently desirable for instructional purposes to provide a simple means of demonstrating the optical aberration, coma, in the laboratory independently of all the other aberrations. In this paper, a lens design consisting of a cemented doublet and a singlet which produces nearly pure coma is described.
W. H. SCIDMORE and P. R. YODER, JR., "A Simple Means of Demonstrating Coma in the Laboratory," J. Opt. Soc. Am. 51, 1432-1432 (1961)