title: Multiple-path telescope: third-order design.
abstract: Exact results for the magnification and effective focal length of a multiple-path telescope are presented. We present analytical results for the third-order design of this system, using the Seidel sums for the five aberration terms. Numerical calculations are used throughout to corroborate these results. Third-order aberrations remain small or at least stable as the number of paths is increased.
authors.forename: J
authors.initials: J
authors.lastname: Castro-Ramos
authors.forename: S
authors.initials: S
authors.lastname: Vázquez-Montiel
authors.forename: M
authors.initials: M
authors.lastname: Fernández-Guasti
authors.forename: A
authors.initials: A
authors.lastname: Cornejo-Rodríguez