title: Optimum solution for spherical primary mirror with two and three aspheric corrector plates located near focus.
abstract: Aspheric corrector plates can provide good aberration control for large spherical primary mirror telescopes, but the regions where good solutions can be obtained are very limited. Two isolated solution regions exist for the two-corrector configuration.
authors.forename: A B
authors.initials: AB
authors.lastname: Meinel
authors.forename: M P
authors.initials: MP
authors.lastname: Meinel