From the brief hands on experience that I had with @Andrew Reid's Z9 and Megadap E mount adapter, I was impressed enough to consider it a bit of a turning point in finally purchasing the Z9 (or Z8 or Z9 or Z8). This review is with a broader range of lenses and setups. There are a couple of EF adapters out there and the one I'm looking at is the Meike with the drop in VND system.  This is their own test video but it looks usable enough.   For M mount (