Irisor irising
An earlier cinematographic technique or wipe effect, in the form of an expanding or diminishing circle, in which a part of the screen is blacked out so that only a portion of the image can be seen by the viewer, usually the lens aperture is circular or oval shaped and is often expanded or contracted as the film rolls, often from one scene to the next, known also asdiaphragm. The camera movment is often termed iris wipe,circle-in/circle-out, or iris-in/iris-out, also refers to the adjustable opening in the lens that allows light to pass through - the measurement for the iris opening is f-stop
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