Quote - Blur the diffuse? You mean spread it around, so there is less contrast? Sort of. Use a Clay node instead. It has an extra parameter for roughness that makes the angle of incidence make less change.

However, nothing in either Diffuse or Clay is going to get back-side SSS to work. By that I mean light passing under the shadow terminator and showing up on the shadow side. That is true SSS and we just can't do it.

i was reading this 
www.superrune.com/technical/software_superscattering.php

the diffuse and shadows are blured. the texture that is on top is sharp and in focus. i