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Creative Glossary > Film > Iris
Term Details
Term: Iris
Subcategory: General
Definition: A valve is inside the lens that dictates the degree of light that can go through it.  When one opens an iris, more light has the opportunity to come through the lens.  And when one closes the iris, less light can pass through it.  The amount at which an iris is closed or opened is set in f-stops.  Some lenses also have t-stops.

Referring Terms
two-block set Aperture Depth of Field F Stop Iris (printing) Irish crochet lace

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