I am in the process of selling off my Canon gear to go back to Contax so be careful. If you start using another camera you may dump the Canon. I have an ME Super in storage somewhere and the 50mm 1.4 Pentax lens which is one beautiful piece of glass. Shot with the 50mm 1.4 the only time I can remember using it. when I looked at the negs, I almost went to all Pentax-