Thank you for interesting discussions.

I agree with  Arraxxon

But if you want full control of the DOF areas and really want to have an exact distance or area to have a sharp or unsharp look, than you let it calculate in Vue - takes long, but the effect will be calculated more realistic

In some situations, the post work DOF effect may be sufficient. 
But, I am interested in more realistic DOF effect.
Unless it is super slow, I take quality rather than speed.
I used  Poser7 DOF.  It was not bad, and it was not super slow.

 I was expecting what bruno021, and Rutra had shown.
The DOF effect shown by Rutra.
It is sharply focused at an area and gradually blurred in the front and the back.

Rutra, how slow was the rendering with DOF compared to the rendering without DOF ?