Sigma Flash Overexposing

Discussion in 'Photography Equipment & Products' started by BeemerPhotography, May 31, 2009.

  1. BeemerPhotography

    BeemerPhotography TPF Noob!

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    Any ideas?

    I've tried and tried to use this flash on eTTL and it will consistently overexpose (though how much overexposed varies). I cut two index cards and taped them over to act as a diffuser, helped, but still overexposed (and for some reason bouncing this flash makes it overexpose worse). I then bought an Omni Bounce Diffuser hoping that it would solve my problem...WRONG. It actually overexposes even more now (again, especially when bounced). I've even tried using their built-in diffuser, but that just makes it worse, because when you flip the diffuser down, it brings the light closer to the diffuser, so it overexposes worse than without anything over it.

    I feel like I was ripped off as I paid ~$150 for a flash that overexposes.

    Any ideas? Do you think it's a defective unit? I just don't know what to do with this thing. I'm considering selling it and getting a Canon 430EX flash.
     
  2. Montana

    Montana TPF Noob!

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    Can you post a photo and some EXIF info? Are you shooting the camera in manual. Settings? Do you have any flash exposure compensation dialed in by accident? Not being rude, just asking some basic questions.

    Derrick
     
  3. KmH

    KmH Helping photographers learn to fish Supporting Member

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    One of the many possible pitfalls from using 3rd party gear that is essentially reverse engineered equipment.
     
  4. BeemerPhotography

    BeemerPhotography TPF Noob!

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    Sigma with Omni Bounce Diffuser & Built-in Diffuser
    [​IMG]

    Sigma Flash with 2 Notecard Diffusers & Built-In Diffuser
    [​IMG]

    Same shot, no flash, just for comparison
    [​IMG]

    Sigma Flash with 2 Notecards Diffusers & Built-In Diffuser
    [​IMG]

    Sigma Flash with 2 Notecard Diffusers & Built-In Diffuser (one of the very FEW that actually did ok)
    [​IMG]
     
  5. BeemerPhotography

    BeemerPhotography TPF Noob!

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    I included all of the EXIF data as I wasn't sure what all you wanted to look at.

    I'm shooting in P mode while the external flash is on.

    I'll check the flash exposure compensation, though I think it's set to 0. Maybe I should try -1 and see if that might help with the overexposure?
     
  6. Montana

    Montana TPF Noob!

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    The exif shows shooting in aperture priority, auto ISO.

    Just set the camera in manual once. ISO 100, aperture around f/8, shutter speed 1/200, make sure flash is in eTTL and try it once. See what happens.


    The blown shot of the little girl was shot ISO 400, ap 1.8, 1/60 shutter. That would overexpose in my opinion.
     
    Last edited: Jun 1, 2009
  7. Dwig

    Dwig TPF Noob!

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    Possibly. BTW, are you sure you have a "EF-530 DG ST EO-ETTL II" and not one of the other versions of the Ef-530 DG ST?
     
  8. BeemerPhotography

    BeemerPhotography TPF Noob!

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    I emailed Sigma regarding this and found out that there is a firmware update that was done on the newer serial models. The older models will not work properly on the Canon EOS 50D without the firmware update.
     

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