This effect is a blur whose radius differs for each pixel and depends on pixel depths.
The radius for a given pixel is known as the
for this pixel and can be configured
thanks to the Coc Function
By default this function is linked to a
model, but it can be changed to
for simpler to use settings
or to any other
Function that maps a number (percentage, time, etc.) to a value
One key parameter inside
that determines the distance at which objects
are perfectly sharp. By default, this distance is linked to the focus distance of the camera, which itself by default is linked to the camera
distance to target.
If prefered, the focus distance can be overridden directly from within the depth of field modifier. This is made by enabling the
inside the DoF function and entering values manually there.