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f-número
f-number [am. angl. ˈɛf ˌnəmbər, brit. angl.] SAM.
f-number
número m. spol f
PONS OpenDict

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Enojezični primeri (nepregledani od uredništva PONS)
Doubling the f-number decreases the relative brightness by a factor of four.
en.wikipedia.org
For example, a camera with a 0.5 mm diameter pinhole, and a 50 mm focal length would have an f-number of 50/0.5, or 100 ("f" /100 in conventional notation).
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
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
He calls the f-number the ratio number, aperture ratio number, and ratio aperture.
en.wikipedia.org

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