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| f-nummer (In photography, the diameter of the aperture expressed in terms of the focal length of the camera lens. The greater the f-number, the less light reaches the film and the more in focus the objects in the foreground and the background will be. For example, with an f-number = 16 the objects in the far background will be in focus. Whereas, with an f-number = 2 the background will be blurry (while foreground objects are in focus)) | |||
| f-værdi | |||
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| focal number | |||
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f-number : 2 短语, 2 学科 |
| 化学 | 1 |
| 运输 | 1 |