f-number nel dizionario italiano Oxford-Paravia

Esempi monolingue (non verificati dalla Redazione di PONS)

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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
A wider aperture, identified by a smaller f-number, allows using a faster shutter speed for the same exposure.
en.wikipedia.org
As with other light readings, shutter speed can be changed as long as the f-number is altered to compensate, e.g. second at gives equivalent exposure to second at.
en.wikipedia.org
Multiple combinations of shutter speed and f-number can give the same exposure value.
en.wikipedia.org
A small f-number like 2.0 indicates a large aperture (more light passes through), while a large f-number like 22 indicates a small aperture (little light passes through).
en.wikipedia.org
Due to the large f-number of a pinhole camera, exposures will often encounter reciprocity failure.
en.wikipedia.org
The result is that the effective f-number of a zone plate is lower than for the corresponding pinhole and the exposure time can be decreased.
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
Depth of field generally increases with decreasing aperture diameter (increasing f-number).
en.wikipedia.org
Doubling the f-number decreases the relative brightness by a factor of four.
en.wikipedia.org

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