Image quality and handling not optimal!

I bought this because I usually Fisheye have no problem with manual focusing or setting. But on my Sony Alpha 65 is neither the display nor the viewfinder was possible a change in the focus determine.

The photographing was carried out at random and thus the results should not be enough even for Leien. There is a clear image noise (coarse grain) visible, no matter what aperture, ISO, etc. are used. Have tried a lot but in the end I decided the lens return.

I am going to bring me the Sigma fisheye, although this will cost a lot more, it has at least autofocus and image quality should be quite good.