DeFocus
for 3ds max 5.x->2012 category: render effect
Simulates camera defocus. Allows you to set different iris shapes and increase light flares. Quite usefull when you want to
blur background to get nice DOF effect.
Defocus radius: Sets effect strength.
Flare gain: Makes light flares brighter.
Circular iris, N-gon shaped: Sets shape of light flare.
Rotate iris: Rotates iris.
Iris edges: The lesser value set, the more circular iris will be. I suggest to use this slider only when number
of sides equals 3 to avoid straight edges.