Aperture Shape and Bokeh

Up until now the default aperture shape has been a simple disk, however now the aperture shape can be directly changed by the user. Some examples of possible shapes include triangle, diamond, pentagon and other higher order polynomials.

The main effect of this is that out of focus highlights in the scene will take on the shape of the aperture. This effect is known as "bokeh."

Here are some images demonstrating the effect.

Here is a heavily out of focus image with a triangular aperture. Notice the highlights on the bubble and the ball in the background appear triangular.

And here is the same scene with a diamond shaped aperture