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
Flower Flower group attended festivals such as Join Alive, Rock in Japan Festival and Countdown Japan. In May 2014, the band released their second song, "Kamisama". In June, it was announced that Flower Flower would perform the four theme songs for the live-action adaptation of Daisuke Igarashi's manga "Little Forest", released in two parts in August 2014 and February 2015. Flower Flower performs the theme songs for each season, with summer and autumn released in 2014 and winter and spring in 2015. The name Flower Flower was picked as Yui wanted something natural in their band name. Flower Flower Vocalist Yui is