New poster here, about to be NEX 6 owner. Among good old lenses I have is a Contax rf Sonnar 1.5 I'd like to use with the 6. Focus for this lens is driven by the camera. I've one adapter I bought which isn't right (no focusing base), and I'm wondering if there is a good good for this lens. There is a Chinese maker which looks like its mount is correct and incorporates the distance/feet scale, but but I've no way of knowing for sure. Anyone know? TIA.