What is the difference between a Manual Iris Lens and Auto Iris Lens?

Manual Iris Lens
The Manual Iris lens is the simplest type of iris control lens with manual adjustment to set the iris opening in a fixed position. These are generally used for fixed lighting applications or where the camera to be used is readily accessible. The lens is outfitted with a ring on the body that can be turned to alter the aperture directly. There are two types of Manual iris lenses, Fixed Manual Iris lenses and Vari focal Manual Iris lens.

The Manual Iris lens is convenient to use where it is not necessary to adjust the lens continuously for correct picture brightness. These types of lens are used with constant light. It is applicable in shopping centers, schools, libraries, and offices. The lens can be turned to alter the aperture directly with the help of a ring which is present on the body.

Auto Iris Lens
The Auto Iris Lens is a type of lens that can be electronically controlled. This type of lens allows maintaining the lighting level. It is applicable where the light condition varies continuously. Auto iris lens allows the camera to adjust to get the best picture in the given lighting conditions. There are two types of Auto iris lenses, Fixed Auto Iris lenses and Vari focal Auto Iris lens.

Auto iris lenses are best lens to use in any application as they are flexible and can adjust to changing light levels. Auto iris lenses are used to produce consistent video signals from cameras that view scenes in any varying light levels. Auto iris lenses combines an electronically controlled iris, which allows the lens to maintain one light level making them ideal for outdoor use or any other applications.