"Please Help" with nex5n + contax g 45mm

Hi

I have tried 2 different adapters. The cheap one ~ $50 was working but you would not want to change lenses too often.
I then bought the Metabones one which was working very well.

The focussing works quite well because of the fairly wide focussing ring. Changing lenses needs also a bit of practise. I decided on having one adapter for each lens.
The 45 is a magnificent lens!
Cheers Volker