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"CoC" stands for "circle of confusion". This parameter controls how strong the Depth-Of-Field effect will be. Smaller values keep a larger range around "Focus Distance" in focus, i.e. more of the image is in focus. Larger values make the effect stronger – only parts of the image exactly at a "Focus Distance" will be sharp, everything else will be blurry. 


The circle of confusion works in conjunction with the F-stop of your camera using the formula below.

dofRadius = focalLength / fStop / 2 / (mm in scene units)

Rs divbox

CoC Radius 2.0

CoC Radius 5.0

CoC Radius 10.0