I'm following this tutorial, purely for the depth of field part and right around the 21 minute mark, I see the depth of field instruction. Although, I'm doing the same thing, I'm getting no variation whatsoever in my depth of field look.  No blur, nothing.  I've gone to very extreme numbers too just to see something with no luck.

Any ideas what I might be doing wrong?  I am also using an Element 3D model so it's basically the same as his tutorial.

Thanks,
Eric