On full-frame cameras the lenses act as normal.There is a problem (on many newer cameras) with the extra exposure capability of very wide aperture lenses not being useful as the sensors will not pick up the extra light (I forget where the cutoff is) but for f/2.8 and slower it is not an issue.I will agree that I do not like to use the shift function of the TS-E 17mm, though shifting the longer TS-E 9