Dr. Desire Charles Emanuel von Monckhoven wrote several of the earliest books on Photography.
The iris acts like the aperture of a camera lens.
The iris is like the aperture part of a camera, which used to also be called the iris.
f-stop
The iris of the camera allows more or less light to enter the camera.
The iris diaphragm is named after the iris, the colored part of the eye, because of its similar appearance and function. Just like the iris controls the amount of light entering the eye, the iris diaphragm in a camera lens controls the amount of light entering the camera.
iris
the iris
The radial and circular muscles of the iris.
A camera's diaphragm and your eye's iris perform the same function in the same way. They both control how much light is allowed through the lens by expanding and contracting.
Like fingerprints, a person's iris is unique. An iris scan is accomplished by a system that uses a device like a digital camera to record details about a person's iris. The image is converted to an iris code and stored in a database for future use.
In photography, the iris refers to the part of the camera lens that controls the amount of light entering the camera, while the aperture refers to the opening in the lens that allows light to pass through. The iris adjusts the size of the aperture to regulate the exposure of the image.
iris