bounce flash

Discussion in 'Beyond the Basics' started by NEPats37, Apr 7, 2007.

  1. NEPats37

    NEPats37 TPF Noob!

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    i am shooting a pretty low light concert and am planning on bouncing the flash using a index card mounted to the flash. i wanted to know how much I should adjust the f-stop by when bouncing the flash. the number on the back of my flash is just for direct flash. is it 1 stop 2 stops?
    thanks
     
  2. Hertz van Rental

    Hertz van Rental TPF Noob!

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    Is it a comp controlled flash or a manual?
    If it's automatic then it will compensate for you.
    If it's manual then the formula for finding the approximate f-stop is:

    f-number = 0.7 x Guide Number/d1 + d2

    where d1 = flash to bounce board distance and d2 = bounce board to subject distance.
     

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