This camera adds lens aperture automation to the Zenit-E. There are several other minor cosmetic changes but only this major change. At least 18 versions of Zenit-EM camera existing. The camera can be found marked Cosmorex with a Cosmogon lens and Kalimar also sold a version of this camera marked "Kalimar SR 300". Cambridge Camera also produced one of these with a Cambron plate [2].
