I'm about to sell all my Leica R lenses including 3 Summiluxes. While trying to research current values I hit a snag. I don't know the difference between 2 and 3 cam, ROM etc. Google hasn't been able to help me either. My 35 Summilux has a row of contacts on the lens mount, so I think that might be a ROM lens, but the 50 and 80 do not. So that still means they could be 2 or 3 cam lenses?

Can anyone help?