Use Finite Number of Blades Turning this attribute on allows customization of the aperture shape using the following attributes. This attribute is off by default, which produces a perfectly round aperture. Number of Blades The aperture is shaped after a regular polygon; this attribute specifies how many sides this polygon has. This can also been seen as the number of blades of the diaphragm that controls the aperture. The minimum number of blades is 3, which produces triangular out-of-focus highlights. Rotation The angle of the rotation to apply on the aperture, in degrees.Lens Aperture