multi off camera flash

Discussion in 'Beyond the Basics' started by VADER1775, Oct 31, 2008.

  1. VADER1775

    VADER1775 TPF Noob!

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    If I use a Nikon D80 in commander mode, with an off camera SB800 and SB600 at the same time, will the power output be the same for the two off camera flashes? Or will the 800 be stronger than the 600, leading to uneven flash?
    Thanks
     
  2. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    Possibly. But it won't be by much. What's the guide numbers on the two flashes?
     
  3. VADER1775

    VADER1775 TPF Noob!

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    98 for the 600, and 125 for the 800
     
  4. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    So the SB800 is a little more powerful. It won't be by much. What you can do to test individual exposures is once you have all your lights setup, go through and fire each one, one at a time. Then fire them all together. That way you can see exactly which light is doing what and how they work together and which ones need to be adjusted up or down.

    Ed: And you can use the GN to determine the power.

    GN / distance to subject = Aperture
    GN / Aperture = distance to subject

    I don't remember off the top of my head, but for every two stop in power down, you halve the GN?

    so at 1/4 the SB600 would be 49.

    SB600 - 1/4 power GN49 / 10' from subject = f/4.9
    SB800 - 1/4 power GN62.5 / 13' from subject = f/4.8XXX

    I'm not sure about the GN according to power, but the equations are right.
     
    Last edited: Oct 31, 2008
  5. VADER1775

    VADER1775 TPF Noob!

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    thank you village idiot, i will give it a try. I don't think it would be a huge difference either.
     

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