Proceedings PaperZoom relay lens for a family of catadioptric objective lenses
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Because of their obscured entrance pupils, variable focal length catadioptric object lenses have characteristics unlike their refractive counterparts. Zoom relay lenses are used to reimage an intermediate image formed by the objective without any reduction of entrance pupil diameter, but the relative aperture varies directly with focal length. Nonetheless the aberrations are correctable, and advantages of the combined field lens and focussing lens together with the liberal space constraints allow insertion of beam splitters, mirrors, temperature compensating lenses, and spectral range correctors. By adding different lenses on either or both conjugates of the relay lens, the zoom relay is used with a family of aspherized Maksutov objectives ranging in aperture form 100 to 300 millimeters.