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
British Dictionary definitions for t-number
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
Word Origin for T-number
from
T (
otal Light Transmission)
Number