title: Prime focus correctors involving aspherics.
abstract: The 380-cm Kitt Peak telescope will have an f/2.8 hyperbolic primary. Three tentative field correctors for prime focus use are described; they each have one or more aspheric surfaces.
authors.affiliation: Itek Corporation, Lexington, Massachusetts, USA.
authors.forename: D H
authors.initials: DH
authors.lastname: Schulte