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The flat refractive surface allows to achieve a perfect spherical aberration correction, so it can be used in different optical systems. For example, the parallel-sided plate can be used for the correction of spherical aberration of the spherical mirror. Similarly it can be applied in the afocal system consisting of the first concave and the second convex mirrors. In such a system the plate thickness is rather big. So the afocal system of two spherical mirrors and the plate was modified: the second mirror was combined with the second surface of a plate. In the afocal system which consist of a concave mirror and an catadioptric planoconcave lens the spherical aberration correction can be achieved by the variation of he lens thickness. The longfocus objective can be built by combination of that scheme and the additional lens system. The possibility of aberration correction in such systems is considered.

The Basic Scheme of the Afocal System and Composition Variants of the Objectives Based on It