Investigation of a "thick" isoplanatic axial gradient-index lens A. E. Alimov Moscow Research Institute of Television, 7a-1 Golianovskaya str., Moscow, 105094, Russia E-mail: deminox@yandex.ru T. S. Rovenskaya Bauman Moscow State Technical University, 5 Second Bauman str., Moscow, 105005, Russia This work is dedicated to the design of a "thick" isoplanatic axial gradient-index lens with spherical surfaces. <...> Aberration properties and design data of such lenses were investigated and systematized. <...>