title: Tilted conic fitting to an off-axis conic surface.
abstract: A better fitting to an off-axis conic section can be obtained if a tilted conic is used. The mathematical equation for the tilting angle is obtained as well as the influence over some of the aberration coefficients.
authors.forename: O
authors.initials: O
authors.lastname: Cardona-Nunez
authors.forename: A
authors.initials: A
authors.lastname: Cornejo-Rodriguez