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T number

noun, Photography
1.
one of a series of calibrations of lens openings according to the intensity of the light actually transmitted by the lens. Symbol: T.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for T number

T-number

noun
1.
(photog) a function of the f-number of a camera lens that takes into account the amount of light actually transmitted by the lens
Word Origin
from T(otal Light Transmission) Number
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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