Aaaahhh, I see! I get you now, I have an old Leica III, can't use the 50mm summicron on anything except Micro 4/3. The Sony camera's seem great, especially if you're doing any video. I had a Fuji X Pro 1, but the autofocus was terrible (although the images were so nice!) I'm planning on getting an Olympus E-M10 III next week to see how that works, I tried one and the autofocus was insane compared to the Fuji! (Not that that matters for vintage lenses!)