Second generation reconnaisance satellites

In 1964 there were two possible paths for the development of Soviet reconnaisance satellites, either modernizing systems based on Zenit-2 and Zenit-4 by concentrating on the camera ssytem and its support subsystems, or to design a new spacecraft with. Actually, both paths were taken. In 1964 the Kuibyshev branch of OKB-1 began draft work on the modernization of the Zenit class of spacecraft. Two new systems were developed:

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