Increase your sampling values in your "Render" PPG. When I say increase, I mean severely crank em up.
If I remember correctly, min=4 and max=8 used to give me acceptable results when using DOF in my renders.
When you start to use DOF for animations you'll realise it's far easier doing DOF in a compositor.
That's one thing I'm looking forward to with v2's integrated compositor.
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Vijay @ Dream Interactive....