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To reduce the aperture of a camera lens. If your pictures are coming out too bright, be sure to stop down the lens. Stopping the lens down allows you to focus on a single point in the frame, rather than having every part of the picture in focus equally.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To reduce the aperture of some lens: The photographer stopped the lens down in order to increase the picture's depth of field. If your photograph is too bright, you should stop down the aperture.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.