title: Exact calculation of the circle of least confusion of a rotationally symmetric mirror.
abstract: The position and dimensions of the circle of least confusion (CLC) on axis for a lensless Schmidt camera telescope operating at F(0.82) are calculated. The camera is to be used in the fluorescence detector of the Pierre Auger Observatory. Our analysis was developed for an aspherical mirror for any on-axis position of the point light source. Our technique uses the intersection of the marginal ray from one side of the aperture with the caustic produced by the intermediate rays from the opposite side of the aperture to locate the CLC.
authors.forename: A
authors.initials: A
authors.lastname: Cordero-Dávila
authors.forename: J
authors.initials: J
authors.lastname: Castro-Ramos