[Lakai]

Yes if Ricoh will implement a mode switch from FF to Aps and vise versa and if the FF body will be designed to accept both lenses without mirror clearance issues. I don t think vignetting will be an issue because the principle is not far different ( but not necessarily the same as you will be using a different lens ) with that of changing aspect ratios implemented in other camera formats and that is instructing your hardware to record only your desired square image or in your case the optimal area specific for your lens.