- an adjustable diaphragm that regulates the amount of light entering an optical instrument, esp a camera. It usually consists of a number of thin metal leaves arranged so that they open out into an approximately circular aperture
| 单词 | iris diaphragm |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 i′ris di′aphragm, [Optics, Photog.]
Collins Concise English Dictionary © HarperCollins Publishers:: iris diaphragm n
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