Depth of field on 2D Sprites

Hi,
I'm using the Post-Processing Depth of field effect. To get it working on my sprites, I got this shader:
https://github.com/traggett/UnitySpriteShaders

and ticked "Write to depth". Now, The depth is being written to the sprite, but it appears as just an outline. Any tips on what I'm doing wrong?

Edit
I fixed it, I had to set the Alpha and Shadow cutoff accordingly. I tried this before but it didn't work, must have something to do with a change I made in camera settings.

 

Hi, could you please take a look at my post?
Is this blue fog or light made by shader?
I have no idea to implement this effect, should I write shader code?