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Pronunciation varies by accent · noun
(photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens..
Use f-number when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
F-number means (photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens..
Common synonyms include f-value.
The opposite depends on the specific sense.
Use f-number where its definition matches the intended context.
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