I'm about to convert to 4/3rds with an EP2. There are 2 or 3 lenses from my Canon EF I want to use on the new camera. Has anyone converted the Canon EF 75-300 f/4-5.6 or the Canon EF fit Sigma 105 2.8 macro? If so, what are the results like and what adapters will I need. Ty. Dave.