I currently have Contax 137md and Yashica FR1 bodies, used with a selection of C/Y bayonet lenses (Yashica/Tamron SP/Vivitar Series 1). Both of these bodies are exhibiting the same problem, namely the perishing of the black foam rubber light traps, resulting in fine particles of very sticky black foam in the film path (not good!!). I have just started considering buying a new Contax body (not auto focus). As the Aria is the least expensive in the range, this is the one I have been looking at. However, I am unsure whether I will be able to use my old lenses on the new body with MM bayonet. Is the new mount backwards compatable? I have tried looking around the forums and on various Contax related websites, but I have been unable to find a definitive answer. Could somebody please help!?