We show that three refracting surfaces (two aspherical and one spherical surface) are sufficient to form, in air, a real image having any lateral magnification, and free from all five monochromatic primary (Seidel) aberrations. The way of finding such systems is described, and examples of them are given.
© 1980 Optical Society of America
G. Schulz, "Primary aberration-free imaging by three refracting surfaces," J. Opt. Soc. Am. 70, 1149-1152 (1980)