Fake DOF in the Compositor You see, I had a very long render of about 5 hours. And in the end I found out that I totally forgot to add depth of field. So now I am thinking of a way to do that: either outside blender or in blender. I should probably be able to do something in compositor. 

Does anybody know if there is a way I can fake depth of field in compositor?

(p.s. I have no object passes)
In order to get realistic Depth of Field a 2d Depth Map is always required:



I'd recommend duplicating the scene, enable the 'Z pass' (Scene > Passes) and rerender the scene via Material Override. Use a simple material, set the Samples to 1 and follow the instructions of this answers: How can I get a Depth of field render pass?