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2017 Word of the Year

diaphragm shutter

noun, Photography.

iris shutter

noun
1.
a camera shutter having a group of overlapping blades that open and close at the center when exposing film.
Also called between-the-lens shutter, diaphragm shutter, iris diaphragm shutter.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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