The problem, and it's (literally) a huge one, with using that lens on a film body is the monstrosity of a finder which is needed for the 16mm and 18mm. Clever engineering yes but almost half again the size of the camera. I predict it will go down in history under the "What were they thinking?" category. At least on an M8 the crop factor makes the existing large but not outrageous 21-24-28 finder usable. I don't predict many of these lenses will be sold other than to M8 users.