Depth of Field using 2D Sprites

So, uh. Depth of Field doesn't seem to affect sprites whatsoever, for some reason.

As you can see in this shot, the 3D cubes are very clearly affected on my background camera, but any 2D
Sprites are ignored and blurred the same way regardless of distance from the perspective camera.

This is using the new Post Processing script Unity is pushing as the successor to Image Effects; although I believe it failed to work just the same.

How can I remedy this? Do Unity sprites not write to Z-depth? Do I need a specific material or shader on these sprites in order to do this? If so, can somebody point me to an otherwise identical unity sprite shader that writes to Z-depth?

(Edit: I've attempted to create a duplicate of the Unity default Sprite shader and switch Zwrite from Off to On; but it seemed to make no effect whatsoever.)

 

I'm having the same issue.
I've tried different dof shaders, adding z-depth but nothing worked.

It works fine with 3d objects but not at all with 2d sprites.
Also you can't find much information about this

 

Are you using the Sprite Renderer to render the sprites? I'm not 100% sure but I think the default sprite renderer is pretty limited in regards to rendering and effects... have you tried changing the material/shader to other than the default or even using quads? (they're technically a 3D object so you might get some luck with that)

 

I'm also struggling with this. It's hard to find information on this issue. Does anyone know of a solution?

 

I also think that using quads would be the first thing to do for that type of things, didn't work for MrTenda ?