At last I seem to have got it right. Long story, bear with me. Recently I got a divine Canon FD 85mm f1.2 L, an awesome beast, which I have honoured with a Metabones Canon FD to m4/3 adapter. Works perfectly. Thinking of a Christmas present for my son, I picked up a near mint Canon FL 58mm f1.2 but found that a Fotodix Canon FD to m4/3 adapter that I bought for it would not fit —*the projecting pin inside the adapter that moves when you rotate the locking ring, clashes with the lenses aperture shutdown ring in the lens fitting position. Online I found various opinions about whether this could be corrected [it seems to be a particular problem with the FL 58mm f1.2 rather than all FL lenses on FD adapters]. Then on a Sony related forum I found advice regarding this lens on an unnamed adapter for Nex — "Just remove the screw that controls the aperture lever on the lens [He actually means the screw/bolt on the adapter.] On an FL lens you won't need it anyway because the lens has its own aperture ring." Dug out my set of mini screwdrivers and undid the said bolt that screws in on the adapter barrel and emerges inside to engage the lenses aperture ring. Now, however, the on/off locking ring on the adapter does goes further than its previous position because it does not have the screw/bolt to stop it. It does have two click stops before it starts turning further, marking the old on/off positions. Now it seems to work perfectly if I stay with the click stops. I will probably shorten the screw/bolt so it does not catch on the lens aperture lever before replacing it. I really should have got the FD 55mm f1.2, which would not have had this problem. Anyone else had this problem on an otherwise fine lens?