All-spherical Cassegrain telescope with a Volosov corrector

Abstract

This paper informs about a construction of an all-spherical Cassegrain telescope with a two lens Volosov corrector. The entrance doublet of the Volosov corrector radically corrects the residual optical aberrations of the system and makes possible the attainment of high quality of images across the field of view of up to 2˚ within the whole visual spectral branch. One optical set of the system was manufactured in the IPP AV CR v.v.i – TOPTEC Center in Turnov in 2005. Its entrance diameter was 280 mm and focal length approximately 2450 mm.