Soviet spy equipment

Zenit-E camera of Krasnogorsk plant (USSR) with a 500 mm lens and tripod "Fotosnayper" is presented spy equipment of Soviet era, the same company and with a tripod, "Fotosnayper." I had such camera in my childhood and I doubt that mighty KGB used such apparatus for spy games. I believe they used Nikon FM-2 or something like this.