PRINCIPAL FOCUS CORRECTION OPTICAL SYSTEM AND REFLECTING TELESCOPE EMPLOYING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a principal focus correction optical system and a reflecting telescope that can attain excellent image-formation performance even at a large angle of view by making a chromatic aberration generated by an atmospheric dispersion correction and a coma aberration small in a well-balanced manner.SOLUTION: A principal focus correction optical system has atmospheric dispersion correction means, and when observing light in a mutually different wavelength area, a position of the atmospheric dispersion correction means is made mutually different in a direction orthogonal to an optical axis.