What's the Difference Between F-Stop and T-Stop?

Everyone has a general idea of what "f-stop" means, despite it also being known as "f-number," "f-ratio," "focal ratio," or "relative aperture." But then there's "t-stop" which is similar but slightly different from f-stop, in that it's a measurement instead of an equation. Richard Schleuning Of Zeiss explains, clearly and concisely, the difference between the two:

[via DV Culture]

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hii...there is no difference between t and f stop.t 2.8 is same as f2(o.5).in meter u can read in f-stop.in this case meter say f 2.8 ,then u put T 2.8 on lens...it means f 2(0.5).this half stop is light transmission..when light comes through lens lens abserves some light .in stop u can measure and compensate of that light also.for more information....http://sclicksphotography.blogspot.com

March 4, 2013 at 12:30AM, Edited September 4, 8:21AM