Diaphragm (optics) bright spots, for example night cityscapes. Some cameras, such as the Olympus XA or lenses such as the MC Zenitar-ME1, however, use a two-bladed diaphragm with right-angle blades creating a square aperture. Similarly, out-of-focus points of light (circles of confusion) appear as polygons with the same number of sides as the aperture has blades. If the blurred light is circular, then it can be inferred that the aperture is either round or the image was shot "wide-open" (with the blades recessed into the sides of the lens, allowing the interior edge of the lens barrel to effectively become the iris).
A Poke in the Eye (With a Sharp Stick) A Poke in the Eye (With a Sharp Stick) A Poke in the Eye (With a Sharp Stick) is the title of the first show in what later became the iconic "Secret Policeman's Ball" series of benefit shows for human rights organization Amnesty International, although it pre-dated by three years the first show to bear that name.. The film of the show was titled "Pleasure At Her Majesty's" which is sometimes mistakenly thought to be the title of the actual benefit show. The landmark 1976 show starring the Monty Python, Beyond The Fringe and The Goodies teams and other top