Diaphragm (optics) the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system. Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris. See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm. A natural optical system that has a diaphragm and an aperture is the human eye. The iris is the diaphragm, and the opening in the iris of the eye (the pupil) is the aperture. An analogous dev in a
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