What's t

Started May 29, 2013 | Discussions thread
cpkuntz Senior Member • Posts: 1,003
Re: What's t

T(named tee /ˈt/[1]) is the 20th letter in the ISO basic Latin alphabet. It is the most commonly used consonant and the second most common letter in the English language.[2]

Source:  http://en.wikipedia.org/wiki/T

Since you're referring this quesiton to a photography forum, may I presume you're referring to t stop?

T-stop [edit]

A T-stop(for Transmission-stops) is an f-number adjusted to account for light transmission efficiency. A lens with a T-stop of N projects an image of the same brightness as an ideal lens with 100% transmission and an f-number of N. For example, an f/2.0 lens with light transmission efficiency of 75% has a T-stop of 2.3. Since real lenses have transmission efficiencies of less than 100%, a lens's T-stop is always greater than its f-number.[6]

Lens light transmission efficiencies of 60%-90% are typical,[7] so T-stops are sometimes used instead of f-numbers to more accurately determine exposure, particularly when using external light meters.[8] T-stops are often used in cinematography, where many images are seen in rapid succession and even small changes in exposure will be noticeable. Cinema camera lenses are typically calibrated in T-stops instead of F-numbers. In still photography, without the need for rigorous consistency of all lenses and cameras used, slight differences in exposure are less important.

Source:  http://en.wikipedia.org/wiki/T_stop#T-stop

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