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
Daisy (given name) Daisy (given name) Daisy is a feminine given name, commonly thought to be derived from the name of the flower. The flower name comes from the Old English word "dægeseage", meaning "day's eye". The name Daisy is therefore ultimately derived from this source. Daisy is also a nickname for Margaret, used because "Marguerite", the French version of that name, is also a French name for the oxeye daisy. It came into popular use in the late Victorian era along with other flower names. Authors Linda Rosenkrantz and Pamela Redmond Satran wrote in their 2007 book "Baby Name Bible" that Daisy