The Zorki-5 comes in two versions. The first one with a square rangefinder window and Industar-50 both collapsible and rigid lens. The second version is very similar to the Zorki-6. With a round rangefinder window and Industar-50 f3.5/50mm lens. It's interesting to mention, that famous KOMETA camera (never was produced in series) initially had ZORKI-5.