Iris diaphragms are essential in the control of light, which makes them essential components in microscopes and cameras. Take ...

Iris scan biometrics is one of two techniques that use unique eyeball characteristics for security and identification ...

A video camera’s focal ratio or F-number describes the aperture of the lens as controlled by the iris. F-numbers conform to an international aperture scale in discrete values such as F1, F1.4, F2, ...

That coloured circle is called the iris… and the black spot in ... shape to focus objects at nearby or far away. Cameras often use a system of lenses, which can be moved to produce focused ...