Quote Originally Posted by Mainecoonmaniac View Post
Didn't know that about aperture blades and Bokeh.
Diaphragm shape only affects bokeh when the shape can be imaged to some degree in the picture. That is most noticeable with a distinct out-of-focus highlight, because it stands out. In fact, if a lens wide open renders Oof highlights as discs with very bright edges, any shape of diaphragm may well produce a more pleasing bokeh as it cuts off the outside of those discs, leaving a more even Oof highlight in the shape of the diaphragm.