state union plant of photographic equipment.e that it was originally designed. the americans made a lot of aircraft carriers that patrolled near our borders, they are needed it was necessary to track, and of course optics played a big role, for example, af4220 cameras were installed, planned and perspective photography, which could photograph and classify any ship at sea during the day, as well as any target on land. the action with the military is the closest. any product for the defense industry was discussed primarily with those for whom it was intended. about the minsk plant, i can say that our specialists, engineers, constantly maintained contact with this plant. we didn't just go there, we went there talk to the specialists who made these cameras, that is, what focal length, what volume should this device be or? a camera so that it would be convenient for us to place it on the plane, in what place. in the closed shooting range of the minsk mechanical institute, in the presence of an authoritative commission, there was a de