Originally posted by orly_andico Additionally, Nikon, Canon, and Minolta all have lenses where you can tweak the amount of correction available (e.g. the Canon 135mm f/2.8 Soft Focus). With these lenses you can deliberately increase the SA, which makes the OOF nicer.
Thank you for your comments, they have helped me understand oof characteristics and causes.
I had a Canon 135 SF and had no idea what was going on - at that time Bokeh was just a word to me! My son has it now - maybe I can convince him to try some Bokeh tests with it.
At this point I'm guessing that a perfect lens' oof image of a point of light would be similar to a gaussian clipped at the edges by the aperture. Is this correct for far-from-focus conditions? Or would the oof disk be uniform intensity in theory?