| NOUN | relation | focal ratio, f number, stop number, speed | the ratio of the focal length to the diameter of a (camera / camera) lens system |
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| Meaning | The ratio of the focal length to the diameter of a (camera / camera) lens system. | |
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| Synonyms | f number, stop number, speed | |
| Broader | ratio | The relative magnitudes of two quantities (usually expressed as a quotient) |
| Spanish | número de foco, razón focal, velocidad | |
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