Concepts in Photography
Aperture
The aperture is one of the three factors that determine the exposure. The aperture housing contains thin, metal plates that open and close to let light through the aperture and into the camera. The size of the aperture is related to the amount of light: a larger aperture allows more light and a smaller aperture allows less light.
Aperture sizes
| Minimum aperture | Medium aperture | Maximum aperture | |||
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The size of the aperture is represented by a value known as an
The smaller the
The opening in the aperture is described as the Exposure Value (EV). Increasing the Exposure Value (+1 EV) means the amount of light doubles. Decreasing the Exposure Value
+1 EV |
F1.4 | F2 | F2.8 | F4 | F5.6 | F8 |
Exposure Value Steps
Aperture opened slightly | Aperture opened wide |
15