I acquired the shift lenses recently. The OM 24 and the 35. One came with a chipped adapter OM-EOS , (no name shown). When focussed at infinity the there was still more travel to go until the stop. I much prefer that the lens rotates to the stop when shooting at infinity.
I ordered two OM-EOS AF chipped adapters from happypagehk on e-bay. The thickness of the adapters is what determines whether the lens is able to reach infinity or go beyond infinity. I have found that happypagehk 'd adapters work the best of what I have used. You can just goggle "happypagehk" and find him.
If you ask for it to be chipped he will do so meaning that if you have the OM 28 / 3.5 then that info will appear in the image description.
I just acquired the OM 50mm 3.5 Macro. It is tiny, weighs nothing, and is sharp.
Also got the 100/2.8 OM which is a little larger but relatively small and SHARP
I neglected to mention that happypagehk also has the C/Y - EOS adapters. They are also AF chipped meaning that when find focus they beep and the yellow light in your viewfinder lights up. I find them to be useful and pretty accurate..