I am feeling that a nice little 90 or 135mm might fit well on the X-bodies. Fast would be awesome.....nothing heavy, of course. It could be an M-mount....or even a smaller legacy SLR lens might fit the bill. I know that shooting long brings the inherent issues with lack of stabilization.....especially if you are using the EVF at 3X to fine tune focus......but so be it. (I don't want to bring the Contax G's into consideration......been there, done that.) Any ideas?