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• T number
  T number

  noun

  one of a series of calibrations of lens openings according to the intensity of the light actually transmitted by the lens. T
• T-number
  T-number

  noun

  photog a function of the f-number of a camera lens that takes into account the amount of light actually transmitted by the lens

T number

American  

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

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T-number British  

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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Etymology

Origin of T-number

from T ( otal Light Transmission ) Number