Helios 44 2/58 M39 M42 Zenit. Aperture and focal length : f2/58. Angular field of view : 38. Number of lenses and element : 6/4. Light filter mating thread : M49x0.75. Closest focusing distance, m : 0.5. Glass on lenses is clean, no fungus, lens in very good cosmetical condition. Optics is excellent: no fungus, […]