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The f-number N is given by: = where f is the focal length, and D is the diameter of the entrance pupil (effective aperture).It is customary to write f-numbers preceded by "f /", which forms a mathematical expression of the entrance pupil's diameter in terms of f and N. [1]
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Increasing f-stop decreases the aperture of a lens. In photography, stopping down refers to increasing the numerical f-stop number (for example, going from f / 2 to f / 4), which decreases the size (diameter) of the aperture of a lens, resulting in reducing the amount of light entering the iris of a lens. [1] [2]: 112
An example: A deep red filter with an f-stop change of 3 stops = A change of 3 f-stops is equivalent to a filter factor of 8. As a consequence of this relationship, filter factors should be multiplied together when such filters are stacked, as opposed to stop adjustments, which should be added together.
The Waterhouse stop or Waterhouse diaphragm is an interchangeable diaphragm with an aperture (hole) for controlling the entry of light into a camera. A thin piece of metal (the diaphragm) is drilled with a hole (the aperture); a set of these with varying hole sizes makes up a set of Waterhouse stops, corresponding to what today we call f-stops ...
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Displays a photographic f-number with a script 'f/' Template parameters [Edit template data] Parameter Description Type Status aperture 1 f-number (aperture). Usually a number, but accepts text. Example 2.8 Number suggested 2nd aperture 2 Second aperture, to denote an aperture range. Separated from first aperture with an en-dash. Example 4 Number optional link link Boolean. Makes the entire ...
This is a route-map template for the F, a New York City Subway service.. For a key to symbols, see {{railway line legend}}.; For information on using this template, see Template:Routemap.