Term - F/number |
| F/number | SWPP Photographic Glossary | Friday 18th July 2025 |
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F/numberThe lens focal length divided by effective diameter of the aperture gives the f/number that's used to indicate the aperture value. Each full f/number halves or doubles image brightness and some lenses can also be controlled in half or third stop steps.
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Information provided by: SWPP |
