T number

noun Photography.
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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World English Dictionary
T-number or T number
photog a function of the f-number of a camera lens that takes into account the amount of light actually transmitted by the lens
[from T(otal Light Transmission) Number]
T number or T number
[from T(otal Light Transmission) Number]

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