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
Eye of the Tiger Eye of the Tiger "Eye of the Tiger" is a song composed by American rock band Survivor. It was released as a single from their third album of the same name "Eye of the Tiger" and was also the theme song for the film "Rocky III", which was released a day before the single. The song was written by Survivor guitarist Frankie Sullivan and keyboardist Jim Peterik, and was recorded at the request of "Rocky III" star, writer, and director Sylvester Stallone, after Queen denied him permission to use "Another One Bites the Dust", the song Stallone intended as the