Hi, Have an urgent question. I have a chance ti receive a Nikon to 4/3 adaptor (not:43 . Now I have a 4/3 to :43: adaptor: is it possible to mount the double adaptor with Nikon lens? What I mean is: Nikon lens to 4/3 adaptor then 4/3 to :43: adaptor; in this way you have twwo adaptors mounted on each other. What happens? Do I lose some stops or is it not possible to meter? Can someone give me some help please?