I made a small test of my 50mm diyTilt lens. How it behaves on the full frame camera. It was not easy - rear lens element was too close to the mirror of what could cause blockage of the mirror or in the worst case, threaten damage. I always say, measure the distance from the mirror to lens mount and always keep that in mind, for APS-C you have much more space to work on the FF is not so much. I will not give you any measurements because if you're trying to do lens as my you need to know what you're doing if you are unsure do not do it. Anyway after a small processing with precise dremel tool i managed to mount the diyTilt lens on 5dMk2 and the are effects of my tests.