f-number (n)~ In photography the diameter of the aperture expressed in…
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f-number (n)~ 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).