I use this adapter with my 500mm f/8 Zuiko Reflex lens. It is a solid fit that locks in both to the camera body and the lens, but is easy to disconnect from both if you have other lenses to employ. It comes in a nice box that would be great for storage, but my MF-1 lives on my 500 all the time, so the box is in the drawer. :) Focusing manually can be a challenge without the viewfinder aids of an SLR camera, but with the bright viewfinder of the E-3 and practice, good focus can be achieved. And of course on image stabilized bodies, the IS can be activated and set manually for the lens focal length. Definitely worthwhile if you have OM lenses.