I'm on the same track, with the same adapter as Gareth Gardner : the old Fotodiox fits well on the OM-bodies, but does not focus to infinity, at least with some of my lenses and wide open.
So today, I went for a walk in my favorite park, armed with my E-M1 on which I had installed the Fotodiox adapter with an old Nikkor 20/3.5 UD lens, opened to f8. On a light Manfrotto monopod for easy walking ...
I shot 3 different 3-shot pano's, 2 vertical ones, and one horizontal. And also 1 2-shot vertical ... All came out near-perfect
Here they are ...
While I was at it, I also used my cheap tilt adapter for Nikkor lenses.
This is with the 24/2 and almost maximum tilt :
With these two adapters, I consider my back covered