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Radial Blur

Radial blur is a Bokeh effect that creates a whirlpool which simulates a swirling camera. You can vary the location, type, and quality of the blur.

Figure 10.61: For clarity of presentation only 2 fields are shown

X,Y
  center of the circle of movement.
Angle
  angle of motion in one direction.
Steps
  number of blur steps to be used in the calculation; increasing this number uses more CPU.
Clear
  to reset its slider to default without affecting others.

For maximum precision you can use the input box. Figure 10.61 has the parameters: Angle = - 35 and Steps = 2.