Difficulty in modification

A smaller F numbered brighter lens has a critical tendency to have larger rear end lens glass and the shorter lens back original construction are the most dreaded problem to meet with Canon EOS body avoiding mirror box construction and kicking up interferences, it had been known as the confronting barrier before the experimental trials. Minolta ROKKOR-PG 50/1,4 had the structural difficulty to be modified on EOS digital body, because of larger rear end lens and it's projected construction. An old model Canon 10D that did not accept any later produced rear designed EF-S lenses because of it's crowded mirror box constructive design, desperate efforts were required to adopt each other, lens piece mounting stopper rings were necessary to be ground utmost. But, luckily, no mirror kick-up hitting phenomena on the most posterior lens element occurred, if 0,5 mm transition toward backward was operated after all.
Actually, the latest modified lens, MD 28/2 with large rear end lens element cannot be set on 10D EOS body as if done the same trial of EOS EF-S lens with no compatibility, but as a matter of fact, 7D body that has a capability to accept EF-S lenses without any interferences, probably because of smaller reflecting mirror designing.
Though I checked the mirror cutting phenomena in the view finder utilizing Leitz Telyt 280 mm TELE lens, revealed no inconvenience to be projected.

As the next step, expansion of uses on long range telephoto lenses I'm keeping, APO-Telyt 280/2,8 with 3,7kg weight, really heavy and pretty APO-Summicron R 180/2, putting on Leica M9 full sized digital formatting image. The focusing method is like this, an old EOS kiss-3 toy like body is set on them for only the purpose for focusing procedure by way of Leica R to EOS adapter, then after that the camera bodies are replaced into M9 for exposure by way of Leica R to Leica M adapter. Though the replacement  rituals look so complicated and boring manner, this is what I had been familiar with while the silver salt film period with 4 inch by 5 inch image photograph shooting, so just returning to social nostalgia, it's interesting somewhat don't you think?
Here, I want to put an emphasis on the advantage point of striped moire cancelling filter-less designing of M9, I insist on the problem of the expensive Canon full sized image formatting models with the resolution quality spoiling filters.