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t-stops
- While f-stops are the theoretical value of aperture, the t-stops determine the actual tested value of light going in, since glass can absorb some light.
- Most photography lenses use f-stops and most cinema lenses use t-stops
Why do most photography manufacturers don't bother with the T-stops?
- Light metering will compensate for the difference in lenses with same f-stops but different t-stops
- Maximum light lost is around 1/3rd of an f-stop, which is not hard to fix in post-processing
- T-stop testing every device is expensive and time-consuming
In cinematography
- In cinematography, it's hard to post-process every scene, so correct exposure amounts are required there.