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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. : T


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


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Word History and Origins

Origin of T number1

from T ( otal Light Transmission ) Number

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