Abstract

The requirements on the optical system of the astrograph for the Interplanetary Solar Stereoscopic Observatory are determined. Versions of orthoscopic optical systems of telescope objectives are considered, and a technique is presented for designing three-mirror objectives with corrected spherical aberration, coma, astigmatism, image curvature, and distortion. Screening in the resulting systems is determined. The results of a design of the astrograph with a focal length of 5 m, an f number of 10, and an angular field in object space of 1° are presented as an example.

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