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Aperture – The size of the virtual camera aperture, in world units. Small aperture sizes reduce the DOF effect.

Center bias – Determines the uniformity of the DOF effect. A value of 0.0 means that light passes uniformly through the aperture. Positive values mean that light is concentrated towards the rim of the aperture, while negative values concentrate light at the center.

Get focal distance from camera – When enabled, the focal distance is determined from the camera target. This setting works only with Maya camera types Camera and Aim or Camera, Aim and Up.

Focus distance – Determines the distance from the camera at which objects will be in perfect focus. Objects closer or farther than this distance will be blurred.

Sides – Enables simulation of the polygonal shape of the aperture of real-world cameras. When disabled, the shape used in calculations is perfectly circular.

Number of sides – Sets the number of sides for the polygonal shape of the aperture.

Rotation – Specifies the orientation of the aperture shape.

Anisotropy – Stretches the bokeh effect horizontally or vertically. If you want the ratio of height to width of the bokeh to be k:1,  then the value for anisotropy should be sqrt(1/k)-1. For example, for anamorphic bokeh, which is 2.39:1, the anisotropy value should be -0.353.