noun
- The ratio of the focal length to the diameter of a (camera) lens system.
- synonyms: focal ratio, f number, speed
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). stop number. Retrieved September 21, 2026, from http://smartdefine.org/stop_number/definitions/1313308 |
| Chicago | WordNet. 2010. "stop number" http://smartdefine.org/stop_number/definitions/1313308 (accessed September 21, 2026). |
| Harvard | WordNet 2010, stop number, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/stop_number/definitions/1313308>. |
| MLA | WordNet. "stop number" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/stop_number/definitions/1313308> |