Sony NEX6 EVF vs. FDA-EV1S(5N)

I just checked the evf on my friend nex 6 and regconize tthe viewfinder is not good, you have to adjust your eye to have a clear view, if not, all you can see is blurry picture.
I go to store and try another Nex6 but result is the same. I had a change to try A57 EVF at the same time, and A57 evf is very good, you just put your eye and don't have to do anything, everything is clear.

Can anyone tell me about Fda-ev1s aka EVF accessory for 5N. Because I found that Nex6 EVF is not like the one on A57/77,  it's quite annoying.