Hey there Gabriel.  You use the "Sample Diameter" and "Focus Diameter" under 
the MultiSample tab in your Scanline Renderer in conjunction with your "Focal 
Distance" and "FStop" on your Camera under the Projection tab.

It's tricky to fine tune, and extremely heavy to calculate.  Best bet is to 
just output Z from the Scanline Renderer and use something like ZDefocus or 
PGBokeh for the defocus.  It'll be a lot quicker to calculate and to adjust for 
your needs.

Hope this helps!

-Travis



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