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T-stops are a measurement of how much light is actually going through the lens at any given f-stop. alan walker baby don t go lyrics T-stops take in account the percentage of light that comes through a lens and mixes it with the f-stop number. guess i just another pit stop So for example a 100mm lens at f/2 with a light transmittance of 75% will have a T-stop of 2 3 Similarly to f-stops the greater the T