Total Newbie question here. Sorry, I'm a Canon DSLR guy venturing into m4/3 territory. Will the Zuiko 14-54 and the 12-60 fit the EM-5 or will they require an adapter? If an adapter is required is it because the mounts are physically different or is it an issue with different auto-focus systems? Is the lens functionality the same? So how do I tell what will fit what within the modern Olympus lens lineup?