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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Why Veterans Day And The Number 11 Are Tied TogetherNovember 11th is the 315th day of the year (except on leap years). It’s also Veterans Day, a federal holiday honoring all military veterans.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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 for T-number
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