Diaphragm (optics) photographic lens is called an iris diaphragm. In the early years of photography, a lens could be fitted with one of a set of interchangeable diaphragms , often as brass strips known as Waterhouse stops or Waterhouse diaphragms. The iris diaphragm in most modern still and video cameras is adjusted by movable blades, simulating the iris of the eye. The diaphragm has two to twenty blades (with most lenses today featuring between five and ten blades), depending on price and quality of the device in which it is used. Straight blades result in polygon shape of the diaphragm opening, while
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