[![enter image description here][1]][1]I'm a newbie I'm a trying to generate a decent texture using shaders, but I can't make it work.
The rendered image is blurred, as it was in motion, but it obviously is not, it's a simple plane with an applied shaders and the camera if fixed over it.

I tried evee as well cycles, I used f 8.0 and the plane as focus object, but nothing.

Any suggestion?

Thanks in advance

The configuration
  [1]: https://i.sstatic.net/P3Yum.png

The rendered image
  [2]: https://i.sstatic.net/bUQv9.jpg