Multi-Exposure/EV

Discussion in 'Beyond the Basics' started by Mumfandc, Feb 1, 2005.

  1. Mumfandc

    Mumfandc TPF Noob!

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    Hi.

    I did a couple multi-exposure shots, and all of them comprised of two shots on one frame. I followed instructions recommended by a book, and got good exposures by setting the EV value to -1 stop (=ing one "correctly" exposed frame...I think).

    However, what's the case for 3 exposures on one frame? I'm thinking -2 but not sure...confused w/the math.
     
  2. Contra|Brett|

    Contra|Brett| TPF Noob!

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    I think you should go -1.5, not -2

    1 exposure = o ev comp
    2 exposures = -1 ev comp (half as much light, twice)
    3 exposures = -1.5 ev comp (one third as much light, 3 times)

    every exposure value is twice as much light as the preceding value.

    i.e. ev 4 is twice as much light as ev 3.
     
  3. Mumfandc

    Mumfandc TPF Noob!

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    ah... got it. Thanks!
     
  4. Contra|Brett|

    Contra|Brett| TPF Noob!

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    no problem
     

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