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-   -   T2,9: how much correspond F? (https://www.dvinfo.net/forum/alternative-imaging-methods/63314-t2-9-how-much-correspond-f.html)

Asa Phelps March 20th, 2006 12:53 PM
T2,9: how much correspond F?
 
Forgot the difference amount about iris value between cinematography and photography lenses:
anyone can help?

Thanks
ASa

Emre Safak March 20th, 2006 02:02 PM
f/2.9, though f/2.8 is the closest standard aperture. From the Wikipedia:
Quote:
Since all lenses absorb some portion of the light passing through them (particularly zoom lenses containing many elements), for exposure purposes a t-stop is sometimes used instead of f-stop. The t-numbers are adjusted so that the amount of light transmitted through the lens at a given t-stop is equal to that going through an ideal non-absorbing lens set at that f-stop. (The t in t-stop stands for transmission.)


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