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).
Auckland Flower Show event. Although the organisers planned to follow up with another show, it has not eventuated. Auckland Flower Show The Auckland Flower Show was a flower and garden show held in Alexandra Park in the suburb of Epsom, Auckland in November 2008. Previously, the Ellerslie Flower Show was held at the same time of year in Auckland, and had been held every year since 1994 (except 1997). In November 2007, the organisers sold the name of the Ellerslie Flower Show and the use of their services to the Christchurch City Council, which intends holding future Ellerslie Flower Shows at Hagley Park