What is an Iris?

The Basics:

The Iris is part of the diaphragm in the lens. Specifically, it consists of a series of overlapping blades which move to control the size of the Aperture.

See Aperture and Diaphragm for more information.

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OTHER WORDS UNDER I

Image Browser Program
Image File
Image Size
Imaging Engine
Infinity
Inkjet Printer
Interchangeable Lens
ISO Speed