I've been experimenting with an adapter made by Fotodiox to fit my Rollei lenses onto my DSLR.  This is not an active adapter - meaning it won't adjust the aperture, nor will it operate the shutter or give you focus confirmation.  However it does feel solid and has its own behind the lens aperture.   If there is interest, I will add these adapters for Canon and Nikon  DSLR's to my store - cost would be approx. $150.   I hope that I don't have to write how great the Rollei glass is - you all already knew that right!  Sorry for the lousy cell phone pics…