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Old March 20th, 2006, 11:53 AM   #1
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T2,9: how much correspond F?

Forgot the difference amount about iris value between cinematography and photography lenses:
anyone can help?

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Old March 20th, 2006, 01:02 PM   #2
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f/2.9, though f/2.8 is the closest standard aperture. From the Wikipedia:
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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