HapZungLam
Oop!

I know it of course but how's the method, there are plenty of them.
I asked such a question as somebody prefer to make depth of field in Max(use default or mental ray or FR), but some prefer to blur in Photoshop with Z-depth generated, some may use Iris Filter, just wanna know which one is more popular.
By the way, where to get full version of Iris Filter from Photoshop.