I used Summitar , Elmar , Summicron and they are all different animals. You must conduct a good research before buying a Leitz lens. Find manufacturing date annals and magazines and compare everything with everything. May be large format Ektar or Wollensak or a Zeiss on Hasselblad is better for you. Leica lenses are for people who have idea on them or you end up saying nikon is better next month.