1. cymruchris

    cymruchris

    Messages:
    2,227
    Name:
    Chris
    Edit My Images:
    Yes
    Where I am it's late - and I'm pretty sure I'm right (aren't we always?) - but would like a confirmation on a thought.

    I'm going somewhere tomorrow where I will be using two x 580EX2 flashguns - If set to manual - and say at 1/64 power on both units - if they were next to each other pointing in the same direction - would that be the equivalent of 1/32 power from a single head? (Roughly)

    Are my brains working? Or am I missing the obvious?

    Please put my mind at rest :)

    (I'm using the flashes in sealed bags - so thinking I might put both in one bag at a lower power, rather than use one at a time at a higher power - then fire them both off at a lower intensity so that the batteries last longer, and I don't have to open the bag so often..... )
     
  2. Terrywoodenpic

    Terrywoodenpic

    Messages:
    5,498
    Name:
    Terry
    Edit My Images:
    Yes
    Two manual flashes at the same power = twice the output= + one stop of power.

    But it is hard to tell about the power usage factor.
     
  3. cymruchris

    cymruchris

    Messages:
    2,227
    Name:
    Chris
    Edit My Images:
    Yes
    Good point - the batteries may not last twice as long by firing off at half the power...
     
  4. HoppyUK

    HoppyUK

    Messages:
    22,467
    Name:
    Richard
    Edit My Images:
    No
    Yes.

    Maybe not exactly twice as long, but there or thereabouts. Very broadly these things work pro-rata, so when you halve the power you'll get twice as many flashes, recycle time will be twice as fast, and the flash duration will be about half, too.
     
    cymruchris likes this.

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