The Tri-Elmar works fine on the R-D1 and the R-D1 framelines match perfectly. I have one and have used it extensively. There are plenty of Tri-Elmar/R-D1 shots in my gallery. As it happens I am selling mine - as I noted in an earlier post today - because I am simplifying my life and will be shooting with a 35mm on the R-D1 for 90% of the time.