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T-stop

[tee-stop]
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noun Photography.
  1. a camera lens aperture setting calibrated to a T number.

Origin of T-stop

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for t-stop

T-stop

noun
  1. a setting of the lens aperture on a camera calibrated photometrically and assigned a T-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