When you adapt a lens for a larger system (full-frame or APS-C) onto a micro four thirds camera, you are essentially cropping the image. Many lenses do not have a problem with this since the focal length is essentially the same from the center to the corners, but fish-eye has a different effect that is critical to the corners.
Do you lose the some/all of the fish-eye effect if you use an adapter, or does an equivalent of the effect carry over to the MFT sensor?