I recently purchased a Goerz Series III, No 3 210 mm lens in barrell. Serial # 65213. The numbers that are engraved on the side of the barrel seem a little di fferent from any that I have seen. They are: 4.6, 6, 12, 24, 48, 96, 192, 384. Are these actual f stops or a different system? If so, how do I convert? Than ks.
Bookmarks