Multiple cameras blur effect problem

Hi!

Wanted to make the siluette layer of my game to have blur effect on the sprites. Figured that using two cameras where one of the cameras use blur image effect from the standard assets and only have the siluette sprites in the active in the clipping mask.

Didnt work as I hoped. Seems like the blur are rendered all over the screen anyway. Below you see the "blur camera" and the main camera and settings of each one. In the first picture the blur camera is active, in the second only main camera is active

How would I achieve what I am looking for?

( I found one answer where someone proposed to use blured sprites. This would be one alternative, but as I am planning on using quite alot of sprites. The time to make 2 of each, and also the amount of extra memory used speaks against that )

Sorry for my bad english :)