Know what you are buying

The wording "for Sony boxes" should be "with a ring for Nex". Indeed, it is only a mechanical connection, nothing electronic. We must put on the Sony menu "objective without tripping." Another text lacks clarity; would have had to write "tripping with unrecognized target."
That said, it works: the opening is fixed, the development is manual. The speed is automatically set; you must go above ISO and use a foot, see a remote trigger for stability. A good test is here:
[...] Here is called Samyang instead of Oting and is tested on other cases as Sony.
With my NEX-7 I have sufficient brightness. There the best goals to 10 or 20x the price, but it's fun to have a 500mm.