In the thread below this one (Sony Alpha SAL85F28 85mm f/2.8 A-mount), I mentioned that, apparently, this combination could not work. I accepted what I had been told, like a good boy, and forget about it. I decided to look at this for myself and found the following: 1. The flange distance in both cases is 44.5mm. 2. The lens flange thickness is 1mm in both cases. 3. The shoulder diameter of a QBM lens is 43.0mm. 4. The throat diameter of an A mount lens is 43.3mm. 5. The flange to lens body on QBM is 7.6mm. 6. The flange to lens body on A mount is 4.4mm What this indicates to me is that by removing the flange on the QBM lens, then an A mount lens flange could be mounted in its place on a 3.2mm spacer, easily machined out of brass. As it only takes the removal of three screws to get the QBM flange off, I am going to do this, ant then see if one of my M43 to A mount adapters will actually fit over the QBM shoulder. If it does, I will remove the entire flange from a surplus A mount lens and see what can be done. The only immediate challenge is to find the M42 adapters, after moving my man-cave from the old stables to the house. I have no idea where they are!