The zdepth mask has very jagged edges in my experience. I use semidieu's ARS2 for masks which I've found gives a smoother result, but I still find issues. Sometimes making an alpha for the affected area can help with cleanup in photoshop.

DoF at render is superior for this reason IMHO, but I've found that 16-20 samples is best for smooth results and even with the speed boost in PP2012 it can be very slow.

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