A unit magnification system is described which is free from Seidel aberrations and which can be used at very high aperture. The leading higher order aberrations are derived.
A method using this system for reproducing photographically small groups of lines with a spacing of 6000 lines/in. is described.
Several other possible applications of the system are outlined.
J. DYSON, "Unit Magnification Optical System without Seidel Aberrations," J. Opt. Soc. Am. 49, 713-715 (1959)