stop down

verb
stopped down; stopping down; stops down

Definition of stop down

transitive verb

: to reduce the effective aperture of (a lens) by means of a diaphragm

First Known Use of stop down

circa 1891, in the meaning defined above

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The first known use of stop down was circa 1891

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Cite this Entry

“Stop down.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/stop%20down. Accessed 22 Oct. 2020.

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