A compact three-mirror astronomical objective

Resumo

A procedure for synthesizing a mirror astronomical objective with small axial dimensions is proposed. The objective contains two reflecting surfaces one of which is aspheric. Radiation is reflected from it twice with the result that the optical arrangement of the objective becomes three-mirror. An example of the calculation according to the proposed procedure of the long-focus mirror objective with a focal distance of 2000 mm and a relative aperture of 1: 8 is presented.