I went to a store to test the A7II with my existing Rainbow Imaging Canon FD adapter but it just does not want to fit in and neither it worked on the A7S but worked fine on the A7. What has changed? I heard that the regular Fotodiox NEX to Canon FD works. I do have one but I did not have it with me when I drove to that far away store. I am looking at both and cant tell much difference really. I am thinking on just buying one that says its compatible to play it safe as my A7II arrives on Wednesday. What you guys think?