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To increase the aperture of a photographic lens, moving from an f/stop represented by a higher number to an f/stop represented by a lower number and causing more light to pass into the camera.

Additional definitions for 'stop up':

stop upTo fill a hole or cavity, or block an opening or passage, as with a plug.
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"stop up." Phrases.net. STANDS4 LLC, 2017. Web. 19 Nov. 2017. <http://www.phrases.net/phrase/stop-up_1450>.

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