Lensbaby-Imagon.
I approached them about this very subject 2 years ago, before the Composer came out. I told them that since they're market was limited, they would have to keep re-inventing the Lensbaby, in order to keep market share, just like Digital, especially, APS-C.
I also told them, that they should open up the rear of the lens, so that high quality tele-converters,
could be used to improve the image quality. A trick I learned with an earlier S.F. lens.