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f-number FÍS, FOTO

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The f-number of the human eye varies from about 8.3 in a very brightly lit place to about 2.1 in the dark. en.wikipedia.org

The f-number of the microlens is determined ultimately by the width of the pixel and its height above the silicon, which determines its focal length. en.wikipedia.org

A small aperture (high f-number) is often required to produce acceptable sharpness across a three-dimensional subject. en.wikipedia.org

Each stop is marked with its corresponding f-number, and represents a halving of the light intensity from the previous stop. en.wikipedia.org

The two equalities in the equation above are each taken by various authors as the definition of working f-number, as the cited sources illustrate. en.wikipedia.org

Doubling the f-number decreases the relative brightness by a factor of four. en.wikipedia.org

For distant subjects (beyond macro range), depth of focus is relatively insensitive to focal length and subject distance, for a fixed f-number. en.wikipedia.org

A wider aperture, identified by a smaller f-number, allows using a faster shutter speed for the same exposure. en.wikipedia.org

A smaller maximum aperture (larger minimum f-number) is slow because it delivers less light intensity and requires a slower shutter speed. en.wikipedia.org

The lower the f-number, the higher light intensity at the focal plane. en.wikipedia.org

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