Thanks. The only reason I asked is that I ran across a negative thread on the "N" meter. For clarification, the "N" will work on the newer bodies, the newer prisms will not meter on the older bodies, but can be used as prisms and will fit. I waiting on word from Mamiya as to upgrading an older body to use the newer prisms, but then, why? The "N" prism is cheaper, but I just want to know if it can be done.