I have been looking for an Adaptall to allow for Tamron lenses to mount on my Leica R3. It has caused a bit confusion as I am not certain what I am looking for and to make matters worse, it seems like many sellers don't know exactly what they are selling. The AE on Leica R3 requires the "3-CAM" to work, but that feature is rarely if ever mentioned. On the other hand, quite a number of sellers states "fits Leica R4" or "fits Leica R-4 to R-7" - These models utilise 3-Cam and the omission of R3 makes me wonder if there is a compatibility issue with the adapter in combination with Leica R3? If I understand correctly, there are also adapters that works only with Leicaflex SL and only with SL in combination with a Tamron mirror lens. I would like to avoid these, of course. And finally is the distinction between Adaptall and Adaptall 2, is that of relevance in this case? Anyone with Leica R and Adaptall experience that can shed a little light on what I should be looking for?