See also Using the Depth of Field filter.
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Specifies the width (in centimeters) for the area of sharpest focus in the . Regions outside the are blurred based on the value.
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Specifies the distance (in centimeters) from the viewing camera to the center of the area. The is connected to the camera. That is, as you dolly the camera back and forth, the also moves in relation to the object.
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Specifies the amount of blur outside the area when simulating the depth of field effect. Lower values blur areas outside the to a lesser degree than higher values.