Is it possible to use AF 4/3 lenses on the EP1/2/GF1 while retaining the focusing motor functionality? I'm aware of using legacy manual focus lenses on the micro four thirds, but I'm hoping to be able to use autofocus lenses. And the selection of micro four thirds lenses aren't that much right now as well. Particularly interested in using tele portrait lenses. If it's possible, which brands of lenses and adapters work? Thanks!