Off-camera flash: I'm confused.

Discussion in 'Photography' started by HC, Feb 5, 2005.

  1. HC

    HC Guest

    I'm confused.

    Buddy of mine loaned me an el cheapo flash and an optical trigger. I set
    the shutter speed, aperture, and white balance manually on my Digital Rebel.
    I took several shots with only the on-camera flash. Then, I took several
    more shots from the same position with the on-camera flash triggering the
    off-camera flash. In every instance, the exposure with two flashes was
    noticeably darker.

    What am I missing?

    Thanks :D
    HC, Feb 5, 2005
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  2. HC

    me Guest

    The off camera flash is probably (surely?) upsetting the overall exposure.
    What is (how is?) the overall exposure being determined? What settings are
    you using on the camera and the flashes? Remember you have two light sources
    that must be controlled in order to have the correct amount of total light
    on your subject. What is controlling the amount of light from the off camera
    me, Feb 6, 2005
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  3. Could it be that your camera is putting out a pre-flash to determine the
    correct flash exposure for the built in flash? I use a Canon Elan IIe and
    it uses a brief pre-flash (fast enough that you can't see it) to determine
    the flash exposure. I was able to defeat this problem by moving my Canon
    380EX speedlight off camera using the Canon off camera cord. When you use
    this cord to link the flash to the camera, it disables the pre-flash;
    allowing me to use it with a series of slave operated flashes.
    Robert Stewart, Feb 6, 2005
  4. HC

    dj_nme Guest

    Another possibility is that the flash on your Digital Rebel is set on
    "red-eye reduction".
    This gives at least one (but probably more) pre-flashes before the
    exposure happens.
    These pre-flashes are probably triggering the off camera flash before
    the shot is actualy taken.

    Perhaps setting the camera up as though you are just using the built-in
    flash, but have the external flash set up as well.
    See how that goes.

    Also, check to see if there is a red-eye setting on the extrnal flash.
    It might have a switch for one, two or three preflashes.

    Other than the above, I realy can't tell without the gear infront of me
    to test it myself.
    dj_nme, Feb 6, 2005
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