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Thread: f-stop trivia

  1. #21

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    Aurora, IL
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    I am only curious as to what is the bet and who won?

  2. #22

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    Sep 2002
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    Quote Originally Posted by Ole
    When doing close-up work the exit pupil becomes
    important for calculating exposure compensation,...
    Is that not inconvenient? Then again I associate
    exit pupils with binoculars. Dan

  3. #23

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    Apr 2005
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    To calculate the diameter of any 250mm lens at f/11. You divide 250 by not 11 but by 11.3137... and get 22.9708691. Remember only the " even" stops are exact. Even stops include 1, 2, 4. 8, 16, 32, 64... the "odd" stops are either the next higher or lower stop divided or multiplied by square root of 2 as the case may be.

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